Question

What is the LCM of two numbers that have no common factor greater than 1

Answer 1

An example is 2 and 3. The LCM is the product of the 2 numbers.

LCM of 2 and 3 = 6.

This is true for all  pairs of numbers that have no common factor greater than 1.

Answer 2

The LCM is the smallest common multiple of two or more numbers. For example, the LCM of 2 and 5 is 10. The least common factor is the smallest common factor of two or more numbers. The smallest factor of every number is 1.