Here are some common prefixes commonly used with the metric system:
1000: kilo, abbreviated k
1,000,000: mega, abbreviated M (uppercase M, to avoid confusion with "milli")
1/1000: milli, abbreviated m (lowercase m)
1/1,000,000: micro, abbreviated µ (or "u" if µ isn't available)
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One million in the metric system is written as 1,000,000. This number represents a quantity that is equivalent to ten hundred thousands or one thousand thousands.
In the metric system, "mega" is a prefix that denotes a factor of one million, represented by the symbol "M." For example, 1 megabyte is equal to 1 million bytes, and 1 megawatt is equal to 1 million watts.
An uppercase M in the metric system stands for the prefix mega, meaning one million. For instance 1Mg is one megagram, or one million grams. Ms would mean one megasecond ( s represents seconds), or one million seconds. Sometimes an uppercase M is mistakenly used for metre, which should be represented by a lowercase m.
The prefix for million is mega-.
In the US metric system, a kilometer is equivalent to 0.6214 miles.
The metric symbol for one million meters is Mm, which stands for megameters.