To determine if 821 is a prime number or a composite number, we simply look at the factors for 821.
If the factors of 821 are only 821 and 1, then we know that 821 is a prime number. Otherwise, 821 is a composite number.
To explain better, if 821 is only divisible by 1 and 821, then it is a prime number, and if 821 is divisible by more than 821 and 1, then it is a composite number.
The factors of 821 are as follows:
1, 821
Therefore, since 821 is divisible by only one and itself, the answer to the
question "Is 821 prime or composite?" is highlighted in blue below.
prime
Is 822 prime or composite?
OK. Now you know that 821 is a prime 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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