To determine if 680 is a prime number or a composite number, we simply look at the factors for 680.
If the factors of 680 are only 680 and 1, then we know that 680 is a prime number. Otherwise, 680 is a composite number.
To explain better, if 680 is only divisible by 1 and 680, then it is a prime number, and if 680 is divisible by more than 680 and 1, then it is a composite number.
The factors of 680 are as follows:
1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680
Therefore, since 680 is divisible by more than one and itself, the answer to the
question "Is 680 prime or composite?" is highlighted in blue below.
composite
Is 681 prime or composite?
OK. Now you know that 680 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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