Factor 196k 196k=2*2*7*7*k we need to get something like x^3 hmm we right now have (2*7)^2 if we multiply that by (2*7)^1, we can beg (2*7)^3, therefor k=2*7=14
tha tnumber is 14
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if k can be any number k can be 1/196, to make it 1, and 1 is a perfect cube
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my bro had an epic idea: what if k is negative the cube root of a negative number is negative so the smallest one would be negative infinity or something
