To determine if 3920 is a prime number or a composite number, we simply look at the factors for 3920.
If the factors of 3920 are only 3920 and 1, then we know that 3920 is a prime number. Otherwise, 3920 is a composite number.
To explain better, if 3920 is only divisible by 1 and 3920, then it is a prime number, and if 3920 is divisible by more than 3920 and 1, then it is a composite number.
The factors of 3920 are as follows:
1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920
Therefore, since 3920 is divisible by more than one and itself, the answer to the
question "Is 3920 prime or composite?" is highlighted in blue below.
composite
Is 3921 prime or composite?
OK. Now you know that 3920 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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