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The list of **all positive divisors** (that is, the list of all integers that **divide 22**) is as follows :

Accordingly:

**800** is multiplo of **1**

**800** is multiplo of **2**

**800** is multiplo of **4**

**800** is multiplo of **5**

**800** is multiplo of **8**

**800** is multiplo of **10**

**800** is multiplo of **16**

**800** is multiplo of **20**

**800** is multiplo of **25**

**800** is multiplo of **32**

**800** is multiplo of **40**

**800** is multiplo of **50**

**800** is multiplo of **80**

**800** is multiplo of **100**

**800** is multiplo of **160**

**800** is multiplo of **200**

**800** is multiplo of **400**

**800** has **17 positive divisors **

In addition we can say of the number **800 that it is even**

800 is an even number, as it is divisible by 2 : 800/2 = 400

The factors for 800 are all the numbers between -800 and 800 , which divide 800 without leaving any remainder. Since 800 divided by -800 is an integer, -800 is a factor of 800 .

Since 800 divided by -800 is a whole number, -800 is a factor of 800

Since 800 divided by -400 is a whole number, -400 is a factor of 800

Since 800 divided by -200 is a whole number, -200 is a factor of 800

Since 800 divided by -160 is a whole number, -160 is a factor of 800

Since 800 divided by -100 is a whole number, -100 is a factor of 800

Since 800 divided by -80 is a whole number, -80 is a factor of 800

Since 800 divided by -50 is a whole number, -50 is a factor of 800

Since 800 divided by -40 is a whole number, -40 is a factor of 800

Since 800 divided by -32 is a whole number, -32 is a factor of 800

Since 800 divided by -25 is a whole number, -25 is a factor of 800

Since 800 divided by -20 is a whole number, -20 is a factor of 800

Since 800 divided by -16 is a whole number, -16 is a factor of 800

Since 800 divided by -10 is a whole number, -10 is a factor of 800

Since 800 divided by -8 is a whole number, -8 is a factor of 800

Since 800 divided by -5 is a whole number, -5 is a factor of 800

Since 800 divided by -4 is a whole number, -4 is a factor of 800

Since 800 divided by -2 is a whole number, -2 is a factor of 800

Since 800 divided by -1 is a whole number, -1 is a factor of 800

Since 800 divided by 1 is a whole number, 1 is a factor of 800

Since 800 divided by 2 is a whole number, 2 is a factor of 800

Since 800 divided by 4 is a whole number, 4 is a factor of 800

Since 800 divided by 5 is a whole number, 5 is a factor of 800

Since 800 divided by 8 is a whole number, 8 is a factor of 800

Since 800 divided by 10 is a whole number, 10 is a factor of 800

Since 800 divided by 16 is a whole number, 16 is a factor of 800

Since 800 divided by 20 is a whole number, 20 is a factor of 800

Since 800 divided by 25 is a whole number, 25 is a factor of 800

Since 800 divided by 32 is a whole number, 32 is a factor of 800

Since 800 divided by 40 is a whole number, 40 is a factor of 800

Since 800 divided by 50 is a whole number, 50 is a factor of 800

Since 800 divided by 80 is a whole number, 80 is a factor of 800

Since 800 divided by 100 is a whole number, 100 is a factor of 800

Since 800 divided by 160 is a whole number, 160 is a factor of 800

Since 800 divided by 200 is a whole number, 200 is a factor of 800

Since 800 divided by 400 is a whole number, 400 is a factor of 800

Multiples of 800 are all integers divisible by 800 , i.e. the remainder of the full division by 800 is zero. There are infinite multiples of 800. The smallest multiples of 800 are:

0 : in fact, 0 is divisible by any integer, so it is also a multiple of 800 since 0 × 800 = 0

800 : in fact, 800 is a multiple of itself, since 800 is divisible by 800 (it was 800 / 800 = 1, so the rest of this division is zero)

etc.

It is possible to determine using mathematical techniques whether an integer is prime or not.

for 800, the answer is:
**No, 800 is not a prime number**.

To know the primality of an integer, we can use several algorithms. The most naive is to try all divisors below the number you want to know if it is prime (in our case 800). We can already eliminate even numbers bigger than 2 (then 4 , 6 , 8 ...). Besides, we can stop at the square root of the number in question (here 28.284 ). Historically, the Eratosthenes screen (which dates back to Antiquity) uses this technique relatively effectively.

More modern techniques include the Atkin screen, probabilistic tests, or the cyclotomic test.

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