To determine if 1280 is a prime number or a composite number, we simply look at the factors for 1280.
If the factors of 1280 are only 1280 and 1, then we know that 1280 is a prime number. Otherwise, 1280 is a composite number.
To explain better, if 1280 is only divisible by 1 and 1280, then it is a prime number, and if 1280 is divisible by more than 1280 and 1, then it is a composite number.
The factors of 1280 are as follows:
1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280
Therefore, since 1280 is divisible by more than one and itself, the answer to the
question "Is 1280 prime or composite?" is highlighted in blue below.
composite
Is 1281 prime or composite?
OK. Now you know that 1280 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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