There is no equivalence.
A kilometre is a measure of length or distance in 1-dimensional space while an acre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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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.
0.0108
1 million acres = 4046.856 sq km (to 3 dp).
What is 823 plus 836?823 plus 836 is 1,659.
836 it is the same