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28,160,000 acres.
44,000 square kilometers is about 16,988.5 square miles.
Benin is 44K square miles, Denmark is 43K square km, Estonia is 45K square km.
There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.