To determine if 19 is a prime number or a composite number, we simply look at the factors for 19.
If the factors of 19 are only 19 and 1, then we know that 19 is a prime number. Otherwise, 19 is a composite number.
To explain better, if 19 is only divisible by 1 and 19, then it is a prime number, and if 19 is divisible by more than 19 and 1, then it is a composite number.
The factors of 19 are as follows:
1, 19
Therefore, since 19 is divisible by only one and itself, the answer to the
question "Is 19 prime or composite?" is highlighted in blue below.
prime
Is 20 prime or composite?
OK. Now you know that 19 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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