To determine if 210 is a prime number or a composite number, we simply look at the factors for 210.
If the factors of 210 are only 210 and 1, then we know that 210 is a prime number. Otherwise, 210 is a composite number.
To explain better, if 210 is only divisible by 1 and 210, then it is a prime number, and if 210 is divisible by more than 210 and 1, then it is a composite number.
The factors of 210 are as follows:
1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210
Therefore, since 210 is divisible by more than one and itself, the answer to the
question "Is 210 prime or composite?" is highlighted in blue below.
composite
Is 211 prime or composite?
OK. Now you know that 210 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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