To determine if 646 is a prime number or a composite number, we simply look at the factors for 646.
If the factors of 646 are only 646 and 1, then we know that 646 is a prime number. Otherwise, 646 is a composite number.
To explain better, if 646 is only divisible by 1 and 646, then it is a prime number, and if 646 is divisible by more than 646 and 1, then it is a composite number.
The factors of 646 are as follows:
1, 2, 17, 19, 34, 38, 323, 646
Therefore, since 646 is divisible by more than one and itself, the answer to the
question "Is 646 prime or composite?" is highlighted in blue below.
composite
Is 647 prime or composite?
OK. Now you know that 646 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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