To determine if 7840 is a prime number or a composite number, we simply look at the factors for 7840.
If the factors of 7840 are only 7840 and 1, then we know that 7840 is a prime number. Otherwise, 7840 is a composite number.
To explain better, if 7840 is only divisible by 1 and 7840, then it is a prime number, and if 7840 is divisible by more than 7840 and 1, then it is a composite number.
The factors of 7840 are as follows:
1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 49, 56, 70, 80, 98, 112, 140, 160, 196, 224, 245, 280, 392, 490, 560, 784, 980, 1120, 1568, 1960, 3920, 7840
Therefore, since 7840 is divisible by more than one and itself, the answer to the
question "Is 7840 prime or composite?" is highlighted in blue below.
composite
Is 7841 prime or composite?
OK. Now you know that 7840 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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