To determine if 684 is a prime number or a composite number, we simply look at the factors for 684.
If the factors of 684 are only 684 and 1, then we know that 684 is a prime number. Otherwise, 684 is a composite number.
To explain better, if 684 is only divisible by 1 and 684, then it is a prime number, and if 684 is divisible by more than 684 and 1, then it is a composite number.
The factors of 684 are as follows:
1, 2, 3, 4, 6, 9, 12, 18, 19, 36, 38, 57, 76, 114, 171, 228, 342, 684
Therefore, since 684 is divisible by more than one and itself, the answer to the
question "Is 684 prime or composite?" is highlighted in blue below.
composite
Is 685 prime or composite?
OK. Now you know that 684 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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