To determine if 1890 is a prime number or a composite number, we simply look at the factors for 1890.
If the factors of 1890 are only 1890 and 1, then we know that 1890 is a prime number. Otherwise, 1890 is a composite number.
To explain better, if 1890 is only divisible by 1 and 1890, then it is a prime number, and if 1890 is divisible by more than 1890 and 1, then it is a composite number.
The factors of 1890 are as follows:
1, 2, 3, 5, 6, 7, 9, 10, 14, 15, 18, 21, 27, 30, 35, 42, 45, 54, 63, 70, 90, 105, 126, 135, 189, 210, 270, 315, 378, 630, 945, 1890
Therefore, since 1890 is divisible by more than one and itself, the answer to the
question "Is 1890 prime or composite?" is highlighted in blue below.
composite
Is 1891 prime or composite?
OK. Now you know that 1890 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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