Sometimes it is, sometimes it isn't. If the two numbers have a GCF of 1, they are co-prime or relatively prime and their LCM will be their product.
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The numbers are relatively prime, or co-prime.
The LCM of 20 and 21 is 420. The LCM of any pair of consecutive integers is their product.
They are 2 and 140 because their LCM is 140 and their product is 280
If the GCF of a given pair of numbers is 1, the LCM will be equal to their product. If the GCF is greater than 1, the LCM will be less than their product. Or, stated another way, if the two numbers have no common prime factors, their LCM will be their product.
The LCM for any pair of natural numbers can be as big as their product.