To determine if 1818 is a prime number or a composite number, we simply look at the factors for 1818.
If the factors of 1818 are only 1818 and 1, then we know that 1818 is a prime number. Otherwise, 1818 is a composite number.
To explain better, if 1818 is only divisible by 1 and 1818, then it is a prime number, and if 1818 is divisible by more than 1818 and 1, then it is a composite number.
The factors of 1818 are as follows:
1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909, 1818
Therefore, since 1818 is divisible by more than one and itself, the answer to the
question "Is 1818 prime or composite?" is highlighted in blue below.
composite
Is 1819 prime or composite?
OK. Now you know that 1818 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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