When the numbers are co-prime, ie have no common factor.
Simplest example is 2 & 3 whose LCM is 6
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The product of the GCF and LCM of a pair of numbers is equal to the product of the numbers.
Yes,LCM of two numbers is their product.
The LCM of two numbers is their product if and only if the two numbers are co prime, that is their HCF is 1. Otherwise their LCM in not their product, in fact, it is their product divided by their HCF.
Product of the two prime numbers is the LCM. For example 3, 7 have 21 as LCM
The GCF of two numbers multiplied by their LCM will equal the product of the original numbers. If you know the GCF, divide it into the product of the two. The result will be the LCM. If the GCF of two numbers is 1, the LCM is their product.