To determine if 518 is a prime number or a composite number, we simply look at the factors for 518.
If the factors of 518 are only 518 and 1, then we know that 518 is a prime number. Otherwise, 518 is a composite number.
To explain better, if 518 is only divisible by 1 and 518, then it is a prime number, and if 518 is divisible by more than 518 and 1, then it is a composite number.
The factors of 518 are as follows:
1, 2, 7, 14, 37, 74, 259, 518
Therefore, since 518 is divisible by more than one and itself, the answer to the
question "Is 518 prime or composite?" is highlighted in blue below.
composite
Is 519 prime or composite?
OK. Now you know that 518 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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