To determine if 1545 is a prime number or a composite number, we simply look at the factors for 1545.
If the factors of 1545 are only 1545 and 1, then we know that 1545 is a prime number. Otherwise, 1545 is a composite number.
To explain better, if 1545 is only divisible by 1 and 1545, then it is a prime number, and if 1545 is divisible by more than 1545 and 1, then it is a composite number.
The factors of 1545 are as follows:
1, 3, 5, 15, 103, 309, 515, 1545
Therefore, since 1545 is divisible by more than one and itself, the answer to the
question "Is 1545 prime or composite?" is highlighted in blue below.
composite
Is 1546 prime or composite?
OK. Now you know that 1545 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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