To determine if 9990 is a prime number or a composite number, we simply look at the factors for 9990.
If the factors of 9990 are only 9990 and 1, then we know that 9990 is a prime number. Otherwise, 9990 is a composite number.
To explain better, if 9990 is only divisible by 1 and 9990, then it is a prime number, and if 9990 is divisible by more than 9990 and 1, then it is a composite number.
The factors of 9990 are as follows:
1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 37, 45, 54, 74, 90, 111, 135, 185, 222, 270, 333, 370, 555, 666, 999, 1110, 1665, 1998, 3330, 4995, 9990
Therefore, since 9990 is divisible by more than one and itself, the answer to the
question "Is 9990 prime or composite?" is highlighted in blue below.
composite
Is 9991 prime or composite?
OK. Now you know that 9990 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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