To determine if 664 is a prime number or a composite number, we simply look at the factors for 664.
If the factors of 664 are only 664 and 1, then we know that 664 is a prime number. Otherwise, 664 is a composite number.
To explain better, if 664 is only divisible by 1 and 664, then it is a prime number, and if 664 is divisible by more than 664 and 1, then it is a composite number.
The factors of 664 are as follows:
1, 2, 4, 8, 83, 166, 332, 664
Therefore, since 664 is divisible by more than one and itself, the answer to the
question "Is 664 prime or composite?" is highlighted in blue below.
composite
Is 665 prime or composite?
OK. Now you know that 664 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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