"Kilogram" is a unit of mass. "League" is a unit of length.
They can't be converted to each other.
Also, the square of mass has no physical significance.
Otherwise it's a greatly stupid question.
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1 cbm to how many kilograms
1 tonne = 1000 kilograms
1 metric ton = 1,000 kilograms
1 troy ounce = 0.0311034768 kilograms
1 short ton = 907.18474 kilograms