To determine if 9920 is a prime number or a composite number, we simply look at the factors for 9920.
If the factors of 9920 are only 9920 and 1, then we know that 9920 is a prime number. Otherwise, 9920 is a composite number.
To explain better, if 9920 is only divisible by 1 and 9920, then it is a prime number, and if 9920 is divisible by more than 9920 and 1, then it is a composite number.
The factors of 9920 are as follows:
1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 155, 160, 248, 310, 320, 496, 620, 992, 1240, 1984, 2480, 4960, 9920
Therefore, since 9920 is divisible by more than one and itself, the answer to the
question "Is 9920 prime or composite?" is highlighted in blue below.
composite
Is 9921 prime or composite?
OK. Now you know that 9920 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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