To determine if 1800 is a prime number or a composite number, we simply look at the factors for 1800.
If the factors of 1800 are only 1800 and 1, then we know that 1800 is a prime number. Otherwise, 1800 is a composite number.
To explain better, if 1800 is only divisible by 1 and 1800, then it is a prime number, and if 1800 is divisible by more than 1800 and 1, then it is a composite number.
The factors of 1800 are as follows:
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 25, 30, 36, 40, 45, 50, 60, 72, 75, 90, 100, 120, 150, 180, 200, 225, 300, 360, 450, 600, 900, 1800
Therefore, since 1800 is divisible by more than one and itself, the answer to the
question "Is 1800 prime or composite?" is highlighted in blue below.
composite
Is 1801 prime or composite?
OK. Now you know that 1800 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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