To determine if 70 is a prime number or a composite number, we simply look at the factors for 70.
If the factors of 70 are only 70 and 1, then we know that 70 is a prime number. Otherwise, 70 is a composite number.
To explain better, if 70 is only divisible by 1 and 70, then it is a prime number, and if 70 is divisible by more than 70 and 1, then it is a composite number.
The factors of 70 are as follows:
1, 2, 5, 7, 10, 14, 35, 70
Therefore, since 70 is divisible by more than one and itself, the answer to the
question "Is 70 prime or composite?" is highlighted in blue below.
composite
Is 71 prime or composite?
OK. Now you know that 70 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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