When they have no common prime factors.
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There is always going to be a LCM. Just multiply the two numbers together to get the a common multiple if you cant find one because the two numbers multiplied together is a common multiple.
Two numbers that are relatively prime (have a GCF of 1) like 25 and 36, will have their product as the LCM.
The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
Multiply them together.
Multiply them together.