To determine if 721 is a prime number or a composite number, we simply look at the factors for 721.
If the factors of 721 are only 721 and 1, then we know that 721 is a prime number. Otherwise, 721 is a composite number.
To explain better, if 721 is only divisible by 1 and 721, then it is a prime number, and if 721 is divisible by more than 721 and 1, then it is a composite number.
The factors of 721 are as follows:
1, 7, 103, 721
Therefore, since 721 is divisible by more than one and itself, the answer to the
question "Is 721 prime or composite?" is highlighted in blue below.
composite
Is 722 prime or composite?
OK. Now you know that 721 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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