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mm is smaller. mm means "millimeter", and the prefix "milli-" means 1/1000.
The "second power" means squared. "Squared" means multiplied by itself. Thus M to the second power = M times M.
M means 1000 V means 5
Mm is greater. "M" means mega- while "m" means milli-.
It means that M is to be multiplied by a thousand giving it a value of 1,000,000 Sometimes it is in brackets like (M) but this also means muliplication by a thousand