To determine if 321 is a prime number or a composite number, we simply look at the factors for 321.
If the factors of 321 are only 321 and 1, then we know that 321 is a prime number. Otherwise, 321 is a composite number.
To explain better, if 321 is only divisible by 1 and 321, then it is a prime number, and if 321 is divisible by more than 321 and 1, then it is a composite number.
The factors of 321 are as follows:
1, 3, 107, 321
Therefore, since 321 is divisible by more than one and itself, the answer to the
question "Is 321 prime or composite?" is highlighted in blue below.
composite
Is 322 prime or composite?
OK. Now you know that 321 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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