The factors of the number 8 are 1, 2, 4 and 8. Since the number is divisible by more than 1 and itself, it is not a prime number.
Know MoreThe number 8 is a rational, even and positive integer. It is also referred to as a composite number, or a nonprime, since it is divisible by factors other than 1 and itself. The number 8 also contains the factor pairs of 1 and 8 and 2 and 4. Another related characteristic of the factors of 8 is that its distinct prime factor is 2, which is the prime number that divides 8 evenly.
Learn more in NumbersFifteen is not a prime number. A prime number is a positive number that has only two possible divisors, 1 and itself. Fifteen can be divided by 3 and 5 as well as 1 and itself.
Full Answer >Forty-three is a prime number. This is due to the fact that it can only be divided by itself and the number one, which is how a number qualifies as a prime number.
Full Answer >The number 1 is not a prime number. A prime number by definition is a positive integer greater than 1 that is evenly divisible by only itself and 1.
Full Answer >83 is a prime number. A prime number is a number that is only divisible by itself and the number 1, without producing a remainder.
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