To determine if 3990 is a prime number or a composite number, we simply look at the factors for 3990.
If the factors of 3990 are only 3990 and 1, then we know that 3990 is a prime number. Otherwise, 3990 is a composite number.
To explain better, if 3990 is only divisible by 1 and 3990, then it is a prime number, and if 3990 is divisible by more than 3990 and 1, then it is a composite number.
The factors of 3990 are as follows:
1, 2, 3, 5, 6, 7, 10, 14, 15, 19, 21, 30, 35, 38, 42, 57, 70, 95, 105, 114, 133, 190, 210, 266, 285, 399, 570, 665, 798, 1330, 1995, 3990
Therefore, since 3990 is divisible by more than one and itself, the answer to the
question "Is 3990 prime or composite?" is highlighted in blue below.
composite
Is 3991 prime or composite?
OK. Now you know that 3990 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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