336
Prime factors of 84 are 2 x 2 x 3 x 7. There are not four different prime numbers that produce a product of 84.
It is not clear whether you want to add the prime numbers, multiply them, or what.
17 x 2 = 34
The only prime factors of 108 are 2 and 3.
When you multiply two prime numbers together they become factors of the number that they equal. Since the number will have factors other than 1 and itself, the number cannot be prime.
It is not possible to multiply two prime numbers and get 90. You can add 43 and 47.
It is not clear whether you want to add the prime numbers, multiply them, or what.
none. 229 is prime
29950795999/pi
5 and 7
5 and 7
1597 is a prime number. You cannot multiply prime numbers to create another prime number.
17 x 2 = 34
The only prime factors of 108 are 2 and 3.
When you multiply two prime numbers together they become factors of the number that they equal. Since the number will have factors other than 1 and itself, the number cannot be prime.
A composite number. (If they are different numbers, keep in mind 1 is not a prime number)
7 + 13 = 20 Note that there are no two prime numbers x and y that multiply to 20.
It is not possible to multiply two prime numbers and get 90. You can add 43 and 47.