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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.