Number 255 is not a prime number. It is a composite number.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. We do not consider 255 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 255 below).

Number of factors: 8.

List of factors/divisors: 1, 3, 5, 15, 17, 51, 85, 255.

Parity: 255 is an odd number.

Perfect square: no (a square number or perfect square is an integer that is the square of an integer).

Perfect number: no, because the sum of its proper divisors is 177 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 248 no | 249 no | 250 no | 251 yes | 252 no | 253 no | 254 no | 255 no | 256 no | 257 yes | 258 no | 259 no | 260 no | 261 no | 262 no |
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