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.
A mirror prime.
No, for example you can't create the number 65, which is not a prime number, by adding any two prime numbers.
None. 251 is a prime number.
The three prime numbers that make 455 when multiplied are 5 x 7 x 13.
Two is the only even prime number. When you add an odd number to another odd number, you get an even number. When you add an even number to an odd number, you get an odd number. 91 is an odd number, therefore the answer is 2 and 89.
Numbers cannot "make" another number prime. If you are looking for the prime factorization of 56, it is 23 * 7.
i think prime numbers
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.
By dividing it by a number that will make the outcome prime.
The concepts of "prime numbers" and "composite numbers" make sense for integers (whole numbers), not for arbitrary real numbers.
225 cannot be factorised into the product of only 3 prime numbers.
7 is a prime number; its only prime factor is 7.
A mirror prime.