Their product.
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Product of the two prime numbers is the LCM. For example 3, 7 have 21 as LCM
When two numbers are relatively prime, the LCM will be their product.
The Least Common Multiple (LCM) of two prime numbers is the product of the two prime numbers. This is because prime numbers only have themselves and 1 as factors, so their LCM is simply their product.
The GCF of any two prime numbers is 1 and the LCM is their product.
When the numbers are co-prime.