To determine if 2780 is a prime number or a composite number, we simply look at the factors for 2780.
If the factors of 2780 are only 2780 and 1, then we know that 2780 is a prime number. Otherwise, 2780 is a composite number.
To explain better, if 2780 is only divisible by 1 and 2780, then it is a prime number, and if 2780 is divisible by more than 2780 and 1, then it is a composite number.
The factors of 2780 are as follows:
1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780
Therefore, since 2780 is divisible by more than one and itself, the answer to the
question "Is 2780 prime or composite?" is highlighted in blue below.
composite
Is 2781 prime or composite?
OK. Now you know that 2780 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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