It depends on the context. 4,000 acres in the heart of New York City would be huge, but the same amount in the arid western US is comparatively small.
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4000 sq miles = 2560000 acres
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.
Answer: 4,000,000 ft² = 91.8273 acres
174,240,000 ft², algebraic steps below: 4,000 acres*43560 ft² 1 acres=174,240,000 ft²
The US has 2,428,224,640 acres of land.