"Long" is a concept of length, while "square" is a concept of area. The question does not make sense.
If you are asking how "big" is a square mile, then it is an area equal to a square that is one mile on each side. It is also 640 acres.
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a square mile
A square mile is an area measurement, not a specific shape. They could be just about anything, as long as they multiply together to make one square mile. 1 mile by 1 mile is a square mile. Two miles by half a mile is a square mile. 1 foot by 5280 miles is a square mile. This means that 8 square miles can be 2 miles by 4 miles or 1 mile by 8 miles.
A mile squared is a mile long and a mile wide, forming a square, so if you walked the width or the length of a squared, you would walk a mile. A mile is a linear measurement, it measures a distance. A square mile, as with a square kilometre, is an area and measures the amount of ground something covers. You cannot change miles to square miles or vice versa.
A square mile is the area of a square with one mile along each edge. It is equal to 640 acres."The square mile" is the nickname given to the City of London (UK) as it is roughly a square mile in size; it has also been given as a nickname of the banking district of London as the major investment banks were sited there.
A square mile is an area, the simplest shape is a square with all sides 1 mile, but it can be any shape. The mile is the same in other countries such as the UK. A US mile is 1760 yards long, so a US square mile equals 3,097,600 square yards. A US mile converts to metric as 1,609.34 meters, so a US square mile equals 2,589,975 square meters, or approximately 2.6 square kilometers.Prior to the 13th century, a mile (Roman mile) was considered to be a thousand average-sized(3') double paces, or 6000 feet.