To determine if 660 is a prime number or a composite number, we simply look at the factors for 660.
If the factors of 660 are only 660 and 1, then we know that 660 is a prime number. Otherwise, 660 is a composite number.
To explain better, if 660 is only divisible by 1 and 660, then it is a prime number, and if 660 is divisible by more than 660 and 1, then it is a composite number.
The factors of 660 are as follows:
1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330, 660
Therefore, since 660 is divisible by more than one and itself, the answer to the
question "Is 660 prime or composite?" is highlighted in blue below.
composite
Is 661 prime or composite?
OK. Now you know that 660 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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