They are: 3*7*11 = 231
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None. 251 is a prime number.
The three prime numbers which multiply to make 231 are 3 x 7 x 11.
Look at the first 2 of these prime numbers. They cannot be even for then they would be divisible by 2, so not prime. Add them together. Two odd numbers added together make an even. Subtract this even number from 50 (also even) so the third number must be even. There is no way of adding 3 prime numbers together to make an even number.
No, for example you can't create the number 65, which is not a prime number, by adding any two prime numbers.
A mirror prime.