To determine if 1257 is a prime number or a composite number, we simply look at the factors for 1257.
If the factors of 1257 are only 1257 and 1, then we know that 1257 is a prime number. Otherwise, 1257 is a composite number.
To explain better, if 1257 is only divisible by 1 and 1257, then it is a prime number, and if 1257 is divisible by more than 1257 and 1, then it is a composite number.
The factors of 1257 are as follows:
1, 3, 419, 1257
Therefore, since 1257 is divisible by more than one and itself, the answer to the
question "Is 1257 prime or composite?" is highlighted in blue below.
composite
Is 1258 prime or composite?
OK. Now you know that 1257 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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