To determine if 1557 is a prime number or a composite number, we simply look at the factors for 1557.
If the factors of 1557 are only 1557 and 1, then we know that 1557 is a prime number. Otherwise, 1557 is a composite number.
To explain better, if 1557 is only divisible by 1 and 1557, then it is a prime number, and if 1557 is divisible by more than 1557 and 1, then it is a composite number.
The factors of 1557 are as follows:
1, 3, 9, 173, 519, 1557
Therefore, since 1557 is divisible by more than one and itself, the answer to the
question "Is 1557 prime or composite?" is highlighted in blue below.
composite
Is 1558 prime or composite?
OK. Now you know that 1557 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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