To determine if 729 is a prime number or a composite number, we simply look at the factors for 729.
If the factors of 729 are only 729 and 1, then we know that 729 is a prime number. Otherwise, 729 is a composite number.
To explain better, if 729 is only divisible by 1 and 729, then it is a prime number, and if 729 is divisible by more than 729 and 1, then it is a composite number.
The factors of 729 are as follows:
1, 3, 9, 27, 81, 243, 729
Therefore, since 729 is divisible by more than one and itself, the answer to the
question "Is 729 prime or composite?" is highlighted in blue below.
composite
Is 730 prime or composite?
OK. Now you know that 729 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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