To determine if 720 is a prime number or a composite number, we simply look at the factors for 720.
If the factors of 720 are only 720 and 1, then we know that 720 is a prime number. Otherwise, 720 is a composite number.
To explain better, if 720 is only divisible by 1 and 720, then it is a prime number, and if 720 is divisible by more than 720 and 1, then it is a composite number.
The factors of 720 are as follows:
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
Therefore, since 720 is divisible by more than one and itself, the answer to the
question "Is 720 prime or composite?" is highlighted in blue below.
composite
Is 721 prime or composite?
OK. Now you know that 720 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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