Miles are a unit of length/distance whereas acres is unit of area. You cannot convert between the two.
If you mean how many square miles are in 4.5 acres:
4.5 acres = 0.007 mi2
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There are no miles in any acres, and no acres in any miles.1 square mile = 640 acres
1,024,000 acres.
Answer: 1,600 acres = 2.5 square miles.
14.0625 square miles in 9,000 acres.
3.90 square miles = 249,600 acres.