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To get the Least Common Multiple (LCM) of 625 and 390625 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:
|625: ||5||5||5||5|| || || || |
The Least Common Multiple (LCM) is: 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 = 390625