To determine if 256 is a prime number or a composite number, we simply look at the factors for 256.
If the factors of 256 are only 256 and 1, then we know that 256 is a prime number. Otherwise, 256 is a composite number.
To explain better, if 256 is only divisible by 1 and 256, then it is a prime number, and if 256 is divisible by more than 256 and 1, then it is a composite number.
The factors of 256 are as follows:
1, 2, 4, 8, 16, 32, 64, 128, 256
Therefore, since 256 is divisible by more than one and itself, the answer to the
question "Is 256 prime or composite?" is highlighted in blue below.
composite
Is 257 prime or composite?
OK. Now you know that 256 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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