There is no such thing as a "square acre" because an acre already is a square unit that is rectangular.
So it's a bit of a paradox to try to square one when the dimensions are already 66x660 feet (43,560 ft.)
Scrooge McDuck once claimed to have three CUBIC acres of space in his money bin. When you consider that even Google defines this in terms of feet to the SIXTH power, the comedy of the size becomes clear.
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An acre is 43,560 sq ft , so 4000 sq ft is 4000/43560 = .092 acres. A little less then a tenth of an acre.
2640 ft x 90 ft = 237,600 sq ft 237,600 sq / 43,560 sq per acre = 5.45455 acres
1 acre = 43,660 sq ft 12 acres = 522,720 sq ft
0.69 acre
0.206611 acre