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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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13y ago

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