One square mile is simply the area contained in a square where each side measures 1 mile.
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The parcel contains 27,878,400 square feet, equal to one square mile. Each side of the parcel measures one mile (5,280 feet). The perimeter length is 21,200 feet. The length of the diagonal is 7,470 feet.
None. A mile is a measure of distance in 1 dimension. A square mile is a measure of area in 2 dimensions. The two measure different things and it makes no sense to try to convert from one to the other.
There are about 2.59 square kilometers in 1 square mile.
One square mile is 640 acres.
A square parcel of land with an area of 40 acres will measure 1,320 feet (1/4 mile) on each side.