To determine if 140 is a prime number or a composite number, we simply look at the factors for 140.
If the factors of 140 are only 140 and 1, then we know that 140 is a prime number. Otherwise, 140 is a composite number.
To explain better, if 140 is only divisible by 1 and 140, then it is a prime number, and if 140 is divisible by more than 140 and 1, then it is a composite number.
The factors of 140 are as follows:
1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
Therefore, since 140 is divisible by more than one and itself, the answer to the
question "Is 140 prime or composite?" is highlighted in blue below.
composite
Is 141 prime or composite?
OK. Now you know that 140 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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