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In any measurement, the accurately known digits and the first doubtful digits are called significant figures.
IF you meant kilometre - it is a measurement of distance under the metric system. 1 kilometre = 1000 metres
The width of the line drawn by a ball-point pen is the measurement I assume you meant. Though it is often given in fractions of a millimetre, fine, medium or thick is usually used.
You can't convert a measurement of area (square) into a measurement of volume (cubic). I'm going to assume you meant 196 cubic feet, which would be 338688 cubic inches.
kg is an abbreviation for kilograms, a measurement of mass or weight. If you meant kilometer, then it is 1,000 meters or 0.6 miles approximately.