To determine if 1820 is a prime number or a composite number, we simply look at the factors for 1820.
If the factors of 1820 are only 1820 and 1, then we know that 1820 is a prime number. Otherwise, 1820 is a composite number.
To explain better, if 1820 is only divisible by 1 and 1820, then it is a prime number, and if 1820 is divisible by more than 1820 and 1, then it is a composite number.
The factors of 1820 are as follows:
1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820
Therefore, since 1820 is divisible by more than one and itself, the answer to the
question "Is 1820 prime or composite?" is highlighted in blue below.
composite
Is 1821 prime or composite?
OK. Now you know that 1820 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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