To determine if 688 is a prime number or a composite number, we simply look at the factors for 688.
If the factors of 688 are only 688 and 1, then we know that 688 is a prime number. Otherwise, 688 is a composite number.
To explain better, if 688 is only divisible by 1 and 688, then it is a prime number, and if 688 is divisible by more than 688 and 1, then it is a composite number.
The factors of 688 are as follows:
1, 2, 4, 8, 16, 43, 86, 172, 344, 688
Therefore, since 688 is divisible by more than one and itself, the answer to the
question "Is 688 prime or composite?" is highlighted in blue below.
composite
Is 689 prime or composite?
OK. Now you know that 688 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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