Assuming you means acres, not arces, the answer is 640.
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One square mile is 640 acres.
One square mile is equal to 3,097,600 square yards
1 square mile = 2.6 square kilometers.
640 acres in a square mile
Miles are distance units, square feet are area units, so there are no square feet in a mile. There are, however, 5 280 linear feet in a mile, so one square mile equals 27 878 400 square feet (5280^2).