To determine if 637 is a prime number or a composite number, we simply look at the factors for 637.
If the factors of 637 are only 637 and 1, then we know that 637 is a prime number. Otherwise, 637 is a composite number.
To explain better, if 637 is only divisible by 1 and 637, then it is a prime number, and if 637 is divisible by more than 637 and 1, then it is a composite number.
The factors of 637 are as follows:
1, 7, 13, 49, 91, 637
Therefore, since 637 is divisible by more than one and itself, the answer to the
question "Is 637 prime or composite?" is highlighted in blue below.
composite
Is 638 prime or composite?
OK. Now you know that 637 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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