None.
A millimetre is a measure of distance while a square metre is a measure of area. The two measure different things and it makes no sense to try to convert from one to the other.
However, if you mean: How many square millimetres are in a square metre it is 1000000. If you think about a square metre, there are 1000 millimetres along the length, 1000 millimetres along the width and so 1000 x 1000 = 1000000 square millimetres in total.
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How many millimeters are in a meter? There are 1000 millimeters in a meter.
There are 1000 millimeters in a meter.
There are 1,000,000 square millimeters in one square meter. This is because a square meter is equivalent to 1,000 millimeters in length and 1,000 millimeters in width. Multiplying these dimensions gives 1,000 x 1,000 = 1,000,000 square millimeters.
1 meter = 1000 millimeters 1 millimeter = 0.001 meter
1 meter = 1000 millimeters 1 millimeter = 0.001 meter