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

Accordingly:

**1225** is multiplo of **1**

**1225** is multiplo of **5**

**1225** is multiplo of **7**

**1225** is multiplo of **25**

**1225** is multiplo of **35**

**1225** is multiplo of **49**

**1225** is multiplo of **175**

**1225** is multiplo of **245**

**1225** has **8 positive divisors **

**1225is an odd number**,as it is not divisible by 2

The factors for 1225 are all the numbers between -1225 and 1225 , which divide 1225 without leaving any remainder. Since 1225 divided by -1225 is an integer, -1225 is a factor of 1225 .

Since 1225 divided by -1225 is a whole number, -1225 is a factor of 1225

Since 1225 divided by -245 is a whole number, -245 is a factor of 1225

Since 1225 divided by -175 is a whole number, -175 is a factor of 1225

Since 1225 divided by -49 is a whole number, -49 is a factor of 1225

Since 1225 divided by -35 is a whole number, -35 is a factor of 1225

Since 1225 divided by -25 is a whole number, -25 is a factor of 1225

Since 1225 divided by -7 is a whole number, -7 is a factor of 1225

Since 1225 divided by -5 is a whole number, -5 is a factor of 1225

Since 1225 divided by -1 is a whole number, -1 is a factor of 1225

Since 1225 divided by 1 is a whole number, 1 is a factor of 1225

Since 1225 divided by 5 is a whole number, 5 is a factor of 1225

Since 1225 divided by 7 is a whole number, 7 is a factor of 1225

Since 1225 divided by 25 is a whole number, 25 is a factor of 1225

Since 1225 divided by 35 is a whole number, 35 is a factor of 1225

Since 1225 divided by 49 is a whole number, 49 is a factor of 1225

Since 1225 divided by 175 is a whole number, 175 is a factor of 1225

Since 1225 divided by 245 is a whole number, 245 is a factor of 1225

Multiples of 1225 are all integers divisible by 1225 , i.e. the remainder of the full division by 1225 is zero. There are infinite multiples of 1225. The smallest multiples of 1225 are:

0 : in fact, 0 is divisible by any integer, so it is also a multiple of 1225 since 0 × 1225 = 0

1225 : in fact, 1225 is a multiple of itself, since 1225 is divisible by 1225 (it was 1225 / 1225 = 1, so the rest of this division is zero)

2450: in fact, 2450 = 1225 × 2

3675: in fact, 3675 = 1225 × 3

4900: in fact, 4900 = 1225 × 4

6125: in fact, 6125 = 1225 × 5

etc.

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

for 1225, the answer is:
**No, 1225 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 1225). 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 35 ). 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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