To determine if 521 is a prime number or a composite number, we simply look at the factors for 521.
If the factors of 521 are only 521 and 1, then we know that 521 is a prime number. Otherwise, 521 is a composite number.
To explain better, if 521 is only divisible by 1 and 521, then it is a prime number, and if 521 is divisible by more than 521 and 1, then it is a composite number.
The factors of 521 are as follows:
1, 521
Therefore, since 521 is divisible by only one and itself, the answer to the
question "Is 521 prime or composite?" is highlighted in blue below.
prime
Is 522 prime or composite?
OK. Now you know that 521 is a prime 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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