Another square number.
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This cannot be properly answered because at least two numbers are required for there to be a least common multiple.
The GCF of the numbers is the greatest common factor no matter what their relationship is. When one number is a multiple of another number, the GCF is the smaller number.
A common multiple
The least common multiple of 30 , 42 = 210
The least common multiple of the numbers 5 and 10 is 10.