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**255is an odd number**,as it is not divisible by 2

The factors for 255 are all the numbers between -255 and 255 , which divide 255 without leaving any remainder. Since 255 divided by -255 is an integer, -255 is a factor of 255 .

Since 255 divided by -255 is a whole number, -255 is a factor of 255

Since 255 divided by -85 is a whole number, -85 is a factor of 255

Since 255 divided by -51 is a whole number, -51 is a factor of 255

Since 255 divided by -17 is a whole number, -17 is a factor of 255

Since 255 divided by -15 is a whole number, -15 is a factor of 255

Since 255 divided by -5 is a whole number, -5 is a factor of 255

Since 255 divided by -3 is a whole number, -3 is a factor of 255

Since 255 divided by -1 is a whole number, -1 is a factor of 255

Since 255 divided by 1 is a whole number, 1 is a factor of 255

Since 255 divided by 3 is a whole number, 3 is a factor of 255

Since 255 divided by 5 is a whole number, 5 is a factor of 255

Since 255 divided by 15 is a whole number, 15 is a factor of 255

Since 255 divided by 17 is a whole number, 17 is a factor of 255

Since 255 divided by 51 is a whole number, 51 is a factor of 255

Since 255 divided by 85 is a whole number, 85 is a factor of 255

Multiples of 255 are all integers divisible by 255 , i.e. the remainder of the full division by 255 is zero. There are infinite multiples of 255. The smallest multiples of 255 are:

0 : in fact, 0 is divisible by any integer, so it is also a multiple of 255 since 0 × 255 = 0

255 : in fact, 255 is a multiple of itself, since 255 is divisible by 255 (it was 255 / 255 = 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 255, the answer is:
**No, 255 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 255). 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 15.969 ). 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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Previous prime number: 251

Next prime number: 257

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