To determine if 990 is a prime number or a composite number, we simply look at the factors for 990.
If the factors of 990 are only 990 and 1, then we know that 990 is a prime number. Otherwise, 990 is a composite number.
To explain better, if 990 is only divisible by 1 and 990, then it is a prime number, and if 990 is divisible by more than 990 and 1, then it is a composite number.
The factors of 990 are as follows:
1, 2, 3, 5, 6, 9, 10, 11, 15, 18, 22, 30, 33, 45, 55, 66, 90, 99, 110, 165, 198, 330, 495, 990
Therefore, since 990 is divisible by more than one and itself, the answer to the
question "Is 990 prime or composite?" is highlighted in blue below.
composite
Is 991 prime or composite?
OK. Now you know that 990 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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