I assume you mean 37 and 13. This is 481
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The LCM of two numbers is one of the numbers when one of the numbers is a multiple of the other. The LCM of two numbers is the product of the numbers when they are relatively prime. In all other cases (like consecutive even numbers that aren't 2 and 4) the LCM is as you describe.
The LCM of two numbers will never be less than the GCF.
The LCM of one number is itself. LCM involves two or more numbers.
The product of the GCF and the LCM is the same as the product of the original two numbers. Divide the product of the original numbers by the GCF. The result will be the LCM.
You need at least two numbers to find an LCM.