To determine if 7780 is a prime number or a composite number, we simply look at the factors for 7780.
If the factors of 7780 are only 7780 and 1, then we know that 7780 is a prime number. Otherwise, 7780 is a composite number.
To explain better, if 7780 is only divisible by 1 and 7780, then it is a prime number, and if 7780 is divisible by more than 7780 and 1, then it is a composite number.
The factors of 7780 are as follows:
1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 3890, 7780
Therefore, since 7780 is divisible by more than one and itself, the answer to the
question "Is 7780 prime or composite?" is highlighted in blue below.
composite
Is 7781 prime or composite?
OK. Now you know that 7780 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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