640 acres = 1 square mile
I don't know what "square mile acre" means.
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A square mile acre would be a measure of "volume" in 4-dimensional hyperspace.
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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.
None. A square mile is a measure of area. Since an acre is itself a measure of area, a square acre is a measure [of volume?] in 4-dimensional hyper space. Because the dimensions are different, according to the rules of elementary dimensional analysis, conversion from one to the other is not valid. In one square mile, there are 640 acres. In one acre, there are 0.0015625 square miles.
A square with an area of 40 acres has side lengths of: 1,320 feet (1/4 mile) each.
An acre is a measure of area while a mile is a measure of distance. The two measure different things. Though acres cannot be converted to miles, they can be converted to square miles. In that case 2.2 million acres is 3437.5 square miles.
There are 43,560 square feet in an acre. This would be a square 208 feet and 8.5 inches on each side. Going in the opposite direction, there are about 640 acres in a square with sides one mile long.