No. You can tell immediately just by looking at it that it's divisible by 5. It may also be
divisible by other numbers, but you don't even have to know that. It's enough that you
found one more number besides '1' and '255' that goes into it evenly, and that alone is
enough to tell you that it's not prime.
255 85,3 17,5,3
Because 51 is not a prime number and the prime factors of 255 are 3, 5 and 17
The prime factorization of 255 is 3 x 5 x 17.
The prime factorization of 255 is 3 x 5 x 17.
3 x 5 x 17 = 255
3x5x17
255 = 3 x 5 x 17
COMPOSITE
255 85,3 17,5,3 3 x 5 x 17 = 255
5*3*17
It is 17 and its other prime factors are 3 and 5
The factors of 255 are:1 3 5 15 17 51 85 255The prime factors are: 3 x 5 x 171, 3, 5, 15, 17, 51, 85, 255