To determine if 621 is a prime number or a composite number, we simply look at the factors for 621.
If the factors of 621 are only 621 and 1, then we know that 621 is a prime number. Otherwise, 621 is a composite number.
To explain better, if 621 is only divisible by 1 and 621, then it is a prime number, and if 621 is divisible by more than 621 and 1, then it is a composite number.
The factors of 621 are as follows:
1, 3, 9, 23, 27, 69, 207, 621
Therefore, since 621 is divisible by more than one and itself, the answer to the
question "Is 621 prime or composite?" is highlighted in blue below.
composite
Is 622 prime or composite?
OK. Now you know that 621 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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