To determine if 9 is a prime number or a composite number, we simply look at the factors for 9.
If the factors of 9 are only 9 and 1, then we know that 9 is a prime number. Otherwise, 9 is a composite number.
To explain better, if 9 is only divisible by 1 and 9, then it is a prime number, and if 9 is divisible by more than 9 and 1, then it is a composite number.
The factors of 9 are as follows:
1, 3, 9
Therefore, since 9 is divisible by more than one and itself, the answer to the
question "Is 9 prime or composite?" is highlighted in blue below.
composite
Is 10 prime or composite?
OK. Now you know that 9 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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