To determine if 1821 is a prime number or a composite number, we simply look at the factors for 1821.
If the factors of 1821 are only 1821 and 1, then we know that 1821 is a prime number. Otherwise, 1821 is a composite number.
To explain better, if 1821 is only divisible by 1 and 1821, then it is a prime number, and if 1821 is divisible by more than 1821 and 1, then it is a composite number.
The factors of 1821 are as follows:
1, 3, 607, 1821
Therefore, since 1821 is divisible by more than one and itself, the answer to the
question "Is 1821 prime or composite?" is highlighted in blue below.
composite
Is 1822 prime or composite?
OK. Now you know that 1821 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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