The only prime factors of 108 are 2 and 3.
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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.
You will need to multiply six prime numbers to obtain 400: 400 = 5*5*2*2*2*2