To determine if 1521 is a prime number or a composite number, we simply look at the factors for 1521.
If the factors of 1521 are only 1521 and 1, then we know that 1521 is a prime number. Otherwise, 1521 is a composite number.
To explain better, if 1521 is only divisible by 1 and 1521, then it is a prime number, and if 1521 is divisible by more than 1521 and 1, then it is a composite number.
The factors of 1521 are as follows:
1, 3, 9, 13, 39, 117, 169, 507, 1521
Therefore, since 1521 is divisible by more than one and itself, the answer to the
question "Is 1521 prime or composite?" is highlighted in blue below.
composite
Is 1522 prime or composite?
OK. Now you know that 1521 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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