To determine if 257 is a prime number or a composite number, we simply look at the factors for 257.
If the factors of 257 are only 257 and 1, then we know that 257 is a prime number. Otherwise, 257 is a composite number.
To explain better, if 257 is only divisible by 1 and 257, then it is a prime number, and if 257 is divisible by more than 257 and 1, then it is a composite number.
The factors of 257 are as follows:
1, 257
Therefore, since 257 is divisible by only one and itself, the answer to the
question "Is 257 prime or composite?" is highlighted in blue below.
prime
Is 258 prime or composite?
OK. Now you know that 257 is a prime 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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