**Convert square miles to acres - unitconverters.net**
https://www.unitconverters.net/area/square-miles-to-acres.htm

It is defined as the area of a square with side lengths of one statute mile (5,280 feet). A square mile is a large area that is equal to 27,878,400 square feet, 3,097,600 square yards, and 640 acres. History/origin: Area is commonly represented in the form of a square with sides of a specific unit of length, written as "square" followed by the chosen unit of length.

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