You don't. The two are completely incompatible units.
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You cannot. 1 metre is a linear measure - a length. A square metre is a measure of area, not length.
Insert the word "linear". They both refer to 1-metre lengths.
You can't. You working with two different dimensions. It's almost like asking how to convert speed to seconds, or temperature to volume.
divide by 1 million
1 square metre = 10000 square centimetres.