To determine if 1155 is a prime number or a composite number, we simply look at the factors for 1155.
If the factors of 1155 are only 1155 and 1, then we know that 1155 is a prime number. Otherwise, 1155 is a composite number.
To explain better, if 1155 is only divisible by 1 and 1155, then it is a prime number, and if 1155 is divisible by more than 1155 and 1, then it is a composite number.
The factors of 1155 are as follows:
1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, 385, 1155
Therefore, since 1155 is divisible by more than one and itself, the answer to the
question "Is 1155 prime or composite?" is highlighted in blue below.
composite
Is 1156 prime or composite?
OK. Now you know that 1155 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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