To determine if 423 is a prime number or a composite number, we simply look at the factors for 423.
If the factors of 423 are only 423 and 1, then we know that 423 is a prime number. Otherwise, 423 is a composite number.
To explain better, if 423 is only divisible by 1 and 423, then it is a prime number, and if 423 is divisible by more than 423 and 1, then it is a composite number.
The factors of 423 are as follows:
1, 3, 9, 47, 141, 423
Therefore, since 423 is divisible by more than one and itself, the answer to the
question "Is 423 prime or composite?" is highlighted in blue below.
composite
Is 424 prime or composite?
OK. Now you know that 423 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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