They are: 23*31 = 713
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A prime number can only have two factors, 1 and itself. 713 has two other factors, 23 and 31, so is not prime.
The factors of 713 are: 1, 23, 31, 713
It is impossible for the product of two prime numbers to be prime. It is impossible for the sum of two prime numbers to be prime as long as one of the numbers isn't 2.
There are two prime numbers that equals 50. The two numbers are 13 & 37. Both numbers are prime, so that's the answer.
Prime numbers have two factors, composite numbers have more than two.