To determine if 1539 is a prime number or a composite number, we simply look at the factors for 1539.
If the factors of 1539 are only 1539 and 1, then we know that 1539 is a prime number. Otherwise, 1539 is a composite number.
To explain better, if 1539 is only divisible by 1 and 1539, then it is a prime number, and if 1539 is divisible by more than 1539 and 1, then it is a composite number.
The factors of 1539 are as follows:
1, 3, 9, 19, 27, 57, 81, 171, 513, 1539
Therefore, since 1539 is divisible by more than one and itself, the answer to the
question "Is 1539 prime or composite?" is highlighted in blue below.
composite
Is 1540 prime or composite?
OK. Now you know that 1539 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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