Which numbers in the following set are prime numbers: (4,7,31, 117, 324)?

1 Answer
Daniel L.
Dec 16, 2016

7 and 31 are prime numbers.

Explanation:

A prime number is a natural number greater than 1 which is only divisible by 1 and itself.

From the set 4 and 324 cannot be prime, because they are even.

The remaining numbers are 7,31 and 117

117 can be written as 117=3xx39=3xx3xx13=3^2xx13, so it is also not a prime number.

Remaining numbers are 7 and 31 and they are prime numbers.

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