To determine if 30 is a prime number or a composite number, we simply look at the factors for 30.
If the factors of 30 are only 30 and 1, then we know that 30 is a prime number. Otherwise, 30 is a composite number.
To explain better, if 30 is only divisible by 1 and 30, then it is a prime number, and if 30 is divisible by more than 30 and 1, then it is a composite number.
The factors of 30 are as follows:
1, 2, 3, 5, 6, 10, 15, 30
Therefore, since 30 is divisible by more than one and itself, the answer to the
question "Is 30 prime or composite?" is highlighted in blue below.
composite
Is 31 prime or composite?
OK. Now you know that 30 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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