To determine if 513 is a prime number or a composite number, we simply look at the factors for 513.
If the factors of 513 are only 513 and 1, then we know that 513 is a prime number. Otherwise, 513 is a composite number.
To explain better, if 513 is only divisible by 1 and 513, then it is a prime number, and if 513 is divisible by more than 513 and 1, then it is a composite number.
The factors of 513 are as follows:
1, 3, 9, 19, 27, 57, 171, 513
Therefore, since 513 is divisible by more than one and itself, the answer to the
question "Is 513 prime or composite?" is highlighted in blue below.
composite
Is 514 prime or composite?
OK. Now you know that 513 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.

