To determine if 520 is a prime number or a composite number, we simply look at the factors for 520.
If the factors of 520 are only 520 and 1, then we know that 520 is a prime number. Otherwise, 520 is a composite number.
To explain better, if 520 is only divisible by 1 and 520, then it is a prime number, and if 520 is divisible by more than 520 and 1, then it is a composite number.
The factors of 520 are as follows:
1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520
Therefore, since 520 is divisible by more than one and itself, the answer to the
question "Is 520 prime or composite?" is highlighted in blue below.
composite
Is 521 prime or composite?
OK. Now you know that 520 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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