To determine if 642 is a prime number or a composite number, we simply look at the factors for 642.
If the factors of 642 are only 642 and 1, then we know that 642 is a prime number. Otherwise, 642 is a composite number.
To explain better, if 642 is only divisible by 1 and 642, then it is a prime number, and if 642 is divisible by more than 642 and 1, then it is a composite number.
The factors of 642 are as follows:
1, 2, 3, 6, 107, 214, 321, 642
Therefore, since 642 is divisible by more than one and itself, the answer to the
question "Is 642 prime or composite?" is highlighted in blue below.
composite
Is 643 prime or composite?
OK. Now you know that 642 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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