4000 is a square number but it is not the square of an integer so it is not a perfect square number.
It depends on what the 4000 square numbers are.
4000 (square feet) = 371.61216 square metersCourtesy of Google.
An acer is a kind of tree so I am not sure about the number of square metres in 4000 acers. If the question is about acres, the answer is 16,187,426 sq metres approx.
Answer: 4000 mi² = 10,359.952 km²
Answer: 4000 ft² = 371.612 m²
63.2455532
4000 acres = 6.25 square miles
Answer: 4000 acres = 6.25 mi²
4000 square metres is 0.988 acres. Saying that one acre is 4000 square metres is likely to be an adequate approximation, unless you are dealing with tens of thousands of acres.
444.4 square yards.
4000