It's not. 4 is a multiple of 2. 2 is a factor of 4 because it can divide into 4 evenly with no remainder.
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It's not. All multiples of 4 will be multiples of 2, but not all multiples of 2 will be multiples of 4. 6, for example.
Since 4 is a multiple of 2, it is automatically the LCM.
1, 2, 4, 8, 16, 32
The least common multiple of 2 , 3 , 4 = 12
If ordered by size, only every other multiple of 2 is a multiple of 4. All multiples of 4 are multiples of 2.
Since 4 is a multiple of 2, it is automatically the LCM.