To determine if 687 is a prime number or a composite number, we simply look at the factors for 687.
If the factors of 687 are only 687 and 1, then we know that 687 is a prime number. Otherwise, 687 is a composite number.
To explain better, if 687 is only divisible by 1 and 687, then it is a prime number, and if 687 is divisible by more than 687 and 1, then it is a composite number.
The factors of 687 are as follows:
1, 3, 229, 687
Therefore, since 687 is divisible by more than one and itself, the answer to the
question "Is 687 prime or composite?" is highlighted in blue below.
composite
Is 688 prime or composite?
OK. Now you know that 687 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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