To determine if 689 is a prime number or a composite number, we simply look at the factors for 689.
If the factors of 689 are only 689 and 1, then we know that 689 is a prime number. Otherwise, 689 is a composite number.
To explain better, if 689 is only divisible by 1 and 689, then it is a prime number, and if 689 is divisible by more than 689 and 1, then it is a composite number.
The factors of 689 are as follows:
1, 13, 53, 689
Therefore, since 689 is divisible by more than one and itself, the answer to the
question "Is 689 prime or composite?" is highlighted in blue below.
composite
Is 690 prime or composite?
OK. Now you know that 689 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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