To determine if 421 is a prime number or a composite number, we simply look at the factors for 421.
If the factors of 421 are only 421 and 1, then we know that 421 is a prime number. Otherwise, 421 is a composite number.
To explain better, if 421 is only divisible by 1 and 421, then it is a prime number, and if 421 is divisible by more than 421 and 1, then it is a composite number.
The factors of 421 are as follows:
1, 421
Therefore, since 421 is divisible by only one and itself, the answer to the
question "Is 421 prime or composite?" is highlighted in blue below.
prime
Is 422 prime or composite?
OK. Now you know that 421 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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