To determine if 2155 is a prime number or a composite number, we simply look at the factors for 2155.
If the factors of 2155 are only 2155 and 1, then we know that 2155 is a prime number. Otherwise, 2155 is a composite number.
To explain better, if 2155 is only divisible by 1 and 2155, then it is a prime number, and if 2155 is divisible by more than 2155 and 1, then it is a composite number.
The factors of 2155 are as follows:
1, 5, 431, 2155
Therefore, since 2155 is divisible by more than one and itself, the answer to the
question "Is 2155 prime or composite?" is highlighted in blue below.
composite
Is 2156 prime or composite?
OK. Now you know that 2155 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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