prime number

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    Find a prime factor of a number

    Say I have a number, for example 212, is there a formula which will find me a prime factor, preferably the smallest or else the largest, of that number (without counting 1 or the number itself)? In this case it would be 2. Note that the smallest factor of a number (again, not counting 1 or the...
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    How to make a cell turn red if the value is a prime number

    I know how to do the Conditional Formatting stuff for cells, but I need to make a cell that turns red if the number is a prime number. I just need to know if there is a formula that returns true if the value is a prime number and false if it isn't. And if you guys know of an add-in for excel...

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