To determine if 685 is a prime number or a composite number, we simply look at the factors for 685.
If the factors of 685 are only 685 and 1, then we know that 685 is a prime number. Otherwise, 685 is a composite number.
To explain better, if 685 is only divisible by 1 and 685, then it is a prime number, and if 685 is divisible by more than 685 and 1, then it is a composite number.
The factors of 685 are as follows:
1, 5, 137, 685
Therefore, since 685 is divisible by more than one and itself, the answer to the
question "Is 685 prime or composite?" is highlighted in blue below.
composite
Is 686 prime or composite?
OK. Now you know that 685 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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