To determine if 2821 is a prime number or a composite number, we simply look at the factors for 2821.
If the factors of 2821 are only 2821 and 1, then we know that 2821 is a prime number. Otherwise, 2821 is a composite number.
To explain better, if 2821 is only divisible by 1 and 2821, then it is a prime number, and if 2821 is divisible by more than 2821 and 1, then it is a composite number.
The factors of 2821 are as follows:
1, 7, 13, 31, 91, 217, 403, 2821
Therefore, since 2821 is divisible by more than one and itself, the answer to the
question "Is 2821 prime or composite?" is highlighted in blue below.
composite
Is 2822 prime or composite?
OK. Now you know that 2821 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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