If you divide 45 by 3, you'll get 15. If you divide 15 by 3, you'll get 5. 5 is prime and can't be reduced further. That makes the prime factorization of 45, 3 x 3 x 5.
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The GCF is 6. That makes the LCM 42.
The LCM is 42
The least common multiple (LCM) of 2 and 42 is 42.
The LCM is 336.
Since 42 is a multiple of 2, it is automatically the LCM.