This cannot be answered because the common multiples of any two or more numbers are infinite.
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The greatest common multiple of any two or more numbers cannot be determined because the common multiples of any two or more numbers are infinite.
There is really no such thing as a "greatest common multiple". Once you find the least common multiple of a set of numbers, you can keep adding the LCM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a greatest multiple.
The greatest common factor of the numbers 323 and 391 is 17.
The GCF is 1.
It is their lowest common multiple which is 221 13 and 17 are both prime numbers