That means that this specific kind of squares have dimensions 1 meter x 1 meter, and therefore an area of 1 square meter.
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The outer boundary of the square meter area - the "edge".
A meaningless question, unless you mean a square of 1 meter side, which is 1 square meter. None.
A cubic meter is one square meter on each side of a cube. Think of a box which is one meter long on each side. A square meter has no height, so you can't really say how many square meters are in a cubic meters.
This means that for every square meter, there are 180 grams.
If the perimeter of a square building is 812 meter then each side is 203 meter long