Umm, you're question seems to have been a bit garbled. If the question was meant to be: Is the LCM of a single number the number itself? In that case the answer is...N/A... LCM (Least Common Multiple) MUST be at least two numbers. Otherwise "common" has no meaning in the title and the least multiple of any number would be 1 x0 =1, x1 =x, etc...
However, if the question was meant to be something like: If a number is a multiple of another number, is their LCM the larger number? In that case, yes.
P.S. "Is the smallest lcm" is redundant. Smallest and least are identical in this situation.
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It is itself and the LCM of 1824 and 32 is 1824
The LCM of a single number such as 4375 is the number itself.
The smallest number divisible by 123456 is 123456 itself. Any number is divisible by itself, making it the smallest multiple of that number. Therefore, the answer is 123456.
The LCM is 168
The Least Common Multiple (LCM) is the smallest number that two or more numbers will divide into evenly.