To determine if 255 is a prime number or a composite number, we simply look at the factors for 255.
If the factors of 255 are only 255 and 1, then we know that 255 is a prime number. Otherwise, 255 is a composite number.
To explain better, if 255 is only divisible by 1 and 255, then it is a prime number, and if 255 is divisible by more than 255 and 1, then it is a composite number.
The factors of 255 are as follows:
1, 3, 5, 15, 17, 51, 85, 255
Therefore, since 255 is divisible by more than one and itself, the answer to the
question "Is 255 prime or composite?" is highlighted in blue below.
composite
Is 256 prime or composite?
OK. Now you know that 255 is a composite number. Use our logic above and see if
you can figure out if the next number on our list is prime or composite before you check your answer.
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