To determine if 780 is a prime number or a composite number, we simply look at the factors for 780.
If the factors of 780 are only 780 and 1, then we know that 780 is a prime number. Otherwise, 780 is a composite number.
To explain better, if 780 is only divisible by 1 and 780, then it is a prime number, and if 780 is divisible by more than 780 and 1, then it is a composite number.
The factors of 780 are as follows:
1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780
Therefore, since 780 is divisible by more than one and itself, the answer to the
question "Is 780 prime or composite?" is highlighted in blue below.
composite
Is 781 prime or composite?
OK. Now you know that 780 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.
|
|
