No.
In order for two factors (i.e. two numbers multiplied together) to result in an even number, at least one of the factors must be even.
Except for "2" all prime numbers by definition must be odd numbers. 168/2 = 84. 84 is not prime. Therefore you are looking for 2 odd factors of 168. But this is a fruitless search as 2 odd numbers multiplied together will never result in an even number.
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The only prime factors of 108 are 2 and 3.
It is prime because only 1 and 71 multiply together to get 71. No other whole numbers multiply to equal 71.
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.
315
It is not clear whether you want to add the prime numbers, multiply them, or what.