You never have to test any factors larger than the square root of the number because you would have already found the number not to be prime if it was divisible by a number larger than that because the other factor would be smaller than the square root in that circumstance. Notice 196 2 2 7 7 since there is an even number of prime factors and they can be grouped in identical pairs we know that 196 has a square root that is a whole number. Kindall feb 5 19 at 22 25.
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