The question really doesn't make sense because an acre is a measurement of area and a kilometer is a measurement of length/distance.
Well i think he meant Km2 (square), not the length. One acre is equal to 4080m2 and One Km square is 1000m2, the rest is easy.
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1 million acres = 4046.856 sq km (to 3 dp).
You can relax and quit worrying about both problems. No number of acres can be converted into km. In fact, no amount of area can be converted into a quantity of length.
2.5 acres
The United States of America is about 3.794 million square miles in area (9.827 million km squared).This is equal to 2,428,160,000 acres.
One square mile = 640 acres.