To determine if 690 is a prime number or a composite number, we simply look at the factors for 690.
If the factors of 690 are only 690 and 1, then we know that 690 is a prime number. Otherwise, 690 is a composite number.
To explain better, if 690 is only divisible by 1 and 690, then it is a prime number, and if 690 is divisible by more than 690 and 1, then it is a composite number.
The factors of 690 are as follows:
1, 2, 3, 5, 6, 10, 15, 23, 30, 46, 69, 115, 138, 230, 345, 690
Therefore, since 690 is divisible by more than one and itself, the answer to the
question "Is 690 prime or composite?" is highlighted in blue below.
composite
Is 691 prime or composite?
OK. Now you know that 690 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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