12,341,234 = 2 x 73 x 137 x 617
It is not clear whether you want to add the prime numbers, multiply them, or what.
1597 is a prime number. You cannot multiply prime numbers to create another prime number.
5 and 7
5 and 7
none. 229 is prime
29950795999/pi
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.
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.
It is prime because only 1 and 71 multiply together to get 71. No other whole numbers multiply to equal 71.