To determine if 728 is a prime number or a composite number, we simply look at the factors for 728.
If the factors of 728 are only 728 and 1, then we know that 728 is a prime number. Otherwise, 728 is a composite number.
To explain better, if 728 is only divisible by 1 and 728, then it is a prime number, and if 728 is divisible by more than 728 and 1, then it is a composite number.
The factors of 728 are as follows:
1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 182, 364, 728
Therefore, since 728 is divisible by more than one and itself, the answer to the
question "Is 728 prime or composite?" is highlighted in blue below.
composite
Is 729 prime or composite?
OK. Now you know that 728 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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