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Never.
33 is the first composite number that is greater than 30 but is not a multiple of 2
No, for any number n greater than zero, the LCM of n and n is n.
It depends on what the numbers are. For example, if the prime numbers you were talking about were 3 and 7, the least common multiple would be 21. If your numbers were 2 and 3, it would be 6.
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