To determine if 280 is a prime number or a composite number, we simply look at the factors for 280.
If the factors of 280 are only 280 and 1, then we know that 280 is a prime number. Otherwise, 280 is a composite number.
To explain better, if 280 is only divisible by 1 and 280, then it is a prime number, and if 280 is divisible by more than 280 and 1, then it is a composite number.
The factors of 280 are as follows:
1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280
Therefore, since 280 is divisible by more than one and itself, the answer to the
question "Is 280 prime or composite?" is highlighted in blue below.
composite
Is 281 prime or composite?
OK. Now you know that 280 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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