To determine if 686 is a prime number or a composite number, we simply look at the factors for 686.
If the factors of 686 are only 686 and 1, then we know that 686 is a prime number. Otherwise, 686 is a composite number.
To explain better, if 686 is only divisible by 1 and 686, then it is a prime number, and if 686 is divisible by more than 686 and 1, then it is a composite number.
The factors of 686 are as follows:
1, 2, 7, 14, 49, 98, 343, 686
Therefore, since 686 is divisible by more than one and itself, the answer to the
question "Is 686 prime or composite?" is highlighted in blue below.
composite
Is 687 prime or composite?
OK. Now you know that 686 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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