To determine if 8720 is a prime number or a composite number, we simply look at the factors for 8720.
If the factors of 8720 are only 8720 and 1, then we know that 8720 is a prime number. Otherwise, 8720 is a composite number.
To explain better, if 8720 is only divisible by 1 and 8720, then it is a prime number, and if 8720 is divisible by more than 8720 and 1, then it is a composite number.
The factors of 8720 are as follows:
1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 4360, 8720
Therefore, since 8720 is divisible by more than one and itself, the answer to the
question "Is 8720 prime or composite?" is highlighted in blue below.
composite
Is 8721 prime or composite?
OK. Now you know that 8720 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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