To determine if 1540 is a prime number or a composite number, we simply look at the factors for 1540.
If the factors of 1540 are only 1540 and 1, then we know that 1540 is a prime number. Otherwise, 1540 is a composite number.
To explain better, if 1540 is only divisible by 1 and 1540, then it is a prime number, and if 1540 is divisible by more than 1540 and 1, then it is a composite number.
The factors of 1540 are as follows:
1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540
Therefore, since 1540 is divisible by more than one and itself, the answer to the
question "Is 1540 prime or composite?" is highlighted in blue below.
composite
Is 1541 prime or composite?
OK. Now you know that 1540 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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