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

Accordingly:

**1000** is multiplo of **1**

**1000** is multiplo of **2**

**1000** is multiplo of **4**

**1000** is multiplo of **5**

**1000** is multiplo of **8**

**1000** is multiplo of **10**

**1000** is multiplo of **20**

**1000** is multiplo of **25**

**1000** is multiplo of **40**

**1000** is multiplo of **50**

**1000** is multiplo of **100**

**1000** is multiplo of **125**

**1000** is multiplo of **200**

**1000** is multiplo of **250**

**1000** is multiplo of **500**

**1000** has **15 positive divisors **

In addition we can say of the number **1000 that it is even**

1000 is an even number, as it is divisible by 2 : 1000/2 = 500

The factors for 1000 are all the numbers between -1000 and 1000 , which divide 1000 without leaving any remainder. Since 1000 divided by -1000 is an integer, -1000 is a factor of 1000 .

Since 1000 divided by -1000 is a whole number, -1000 is a factor of 1000

Since 1000 divided by -500 is a whole number, -500 is a factor of 1000

Since 1000 divided by -250 is a whole number, -250 is a factor of 1000

Since 1000 divided by -200 is a whole number, -200 is a factor of 1000

Since 1000 divided by -125 is a whole number, -125 is a factor of 1000

Since 1000 divided by -100 is a whole number, -100 is a factor of 1000

Since 1000 divided by -50 is a whole number, -50 is a factor of 1000

Since 1000 divided by -40 is a whole number, -40 is a factor of 1000

Since 1000 divided by -25 is a whole number, -25 is a factor of 1000

Since 1000 divided by -20 is a whole number, -20 is a factor of 1000

Since 1000 divided by -10 is a whole number, -10 is a factor of 1000

Since 1000 divided by -8 is a whole number, -8 is a factor of 1000

Since 1000 divided by -5 is a whole number, -5 is a factor of 1000

Since 1000 divided by -4 is a whole number, -4 is a factor of 1000

Since 1000 divided by -2 is a whole number, -2 is a factor of 1000

Since 1000 divided by -1 is a whole number, -1 is a factor of 1000

Since 1000 divided by 1 is a whole number, 1 is a factor of 1000

Since 1000 divided by 2 is a whole number, 2 is a factor of 1000

Since 1000 divided by 4 is a whole number, 4 is a factor of 1000

Since 1000 divided by 5 is a whole number, 5 is a factor of 1000

Since 1000 divided by 8 is a whole number, 8 is a factor of 1000

Since 1000 divided by 10 is a whole number, 10 is a factor of 1000

Since 1000 divided by 20 is a whole number, 20 is a factor of 1000

Since 1000 divided by 25 is a whole number, 25 is a factor of 1000

Since 1000 divided by 40 is a whole number, 40 is a factor of 1000

Since 1000 divided by 50 is a whole number, 50 is a factor of 1000

Since 1000 divided by 100 is a whole number, 100 is a factor of 1000

Since 1000 divided by 125 is a whole number, 125 is a factor of 1000

Since 1000 divided by 200 is a whole number, 200 is a factor of 1000

Since 1000 divided by 250 is a whole number, 250 is a factor of 1000

Since 1000 divided by 500 is a whole number, 500 is a factor of 1000

Multiples of 1000 are all integers divisible by 1000 , i.e. the remainder of the full division by 1000 is zero. There are infinite multiples of 1000. The smallest multiples of 1000 are:

0 : in fact, 0 is divisible by any integer, so it is also a multiple of 1000 since 0 × 1000 = 0

1000 : in fact, 1000 is a multiple of itself, since 1000 is divisible by 1000 (it was 1000 / 1000 = 1, so the rest of this division is zero)

2000: in fact, 2000 = 1000 × 2

3000: in fact, 3000 = 1000 × 3

4000: in fact, 4000 = 1000 × 4

5000: in fact, 5000 = 1000 × 5

etc.

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

for 1000, the answer is:
**No, 1000 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 1000). 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 31.623 ). 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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