A square mile is a unit of area. If we have a square with each side one mile long, the square covers one square mile. A mile is a unit of length. Length has only one dimension while area is two dimensions.
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An acre is a unit of area, and a linear mile is a measure of length, so they cannot really be compared. However, if you mean a square mile, there are 640 acres to a square mile.
One square mile = 3,098,000 square yards.
1 square mile = 2,589,988.11 square meters.
27,878,400 square feet equal 1 square mile.
640 acres = 1 square mile I don't know what "square mile acre" means. * * * * * A square mile acre would be a measure of "volume" in 4-dimensional hyperspace.