To determine if 1400 is a prime number or a composite number, we simply look at the factors for 1400.
If the factors of 1400 are only 1400 and 1, then we know that 1400 is a prime number. Otherwise, 1400 is a composite number.
To explain better, if 1400 is only divisible by 1 and 1400, then it is a prime number, and if 1400 is divisible by more than 1400 and 1, then it is a composite number.
The factors of 1400 are as follows:
1, 2, 4, 5, 7, 8, 10, 14, 20, 25, 28, 35, 40, 50, 56, 70, 100, 140, 175, 200, 280, 350, 700, 1400
Therefore, since 1400 is divisible by more than one and itself, the answer to the
question "Is 1400 prime or composite?" is highlighted in blue below.
composite
Is 1401 prime or composite?
OK. Now you know that 1400 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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