To determine if 1140 is a prime number or a composite number, we simply look at the factors for 1140.
If the factors of 1140 are only 1140 and 1, then we know that 1140 is a prime number. Otherwise, 1140 is a composite number.
To explain better, if 1140 is only divisible by 1 and 1140, then it is a prime number, and if 1140 is divisible by more than 1140 and 1, then it is a composite number.
The factors of 1140 are as follows:
1, 2, 3, 4, 5, 6, 10, 12, 15, 19, 20, 30, 38, 57, 60, 76, 95, 114, 190, 228, 285, 380, 570, 1140
Therefore, since 1140 is divisible by more than one and itself, the answer to the
question "Is 1140 prime or composite?" is highlighted in blue below.
composite
Is 1141 prime or composite?
OK. Now you know that 1140 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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