To determine if 1420 is a prime number or a composite number, we simply look at the factors for 1420.
If the factors of 1420 are only 1420 and 1, then we know that 1420 is a prime number. Otherwise, 1420 is a composite number.
To explain better, if 1420 is only divisible by 1 and 1420, then it is a prime number, and if 1420 is divisible by more than 1420 and 1, then it is a composite number.
The factors of 1420 are as follows:
1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420
Therefore, since 1420 is divisible by more than one and itself, the answer to the
question "Is 1420 prime or composite?" is highlighted in blue below.
composite
Is 1421 prime or composite?
OK. Now you know that 1420 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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