You can use kilometer, but end up with fairly large numbers, which are best written in scientific notation. It is quite possible to deal with those, but perhaps due to a lack of familiarity of the general public with scientific notation, light-years and parsecs are often used instead. When using these units, you end up with smaller numbers. For example, the distance to the nearest star (after the Sun) is about 4.2 light-years; each light-year is about 9.5 x 1012 km, that is a 13-digit number if you write it out.
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There are 1000 metres in 1 kilometre. Therefore, a metre is larger than a kilometre. (You use metres and kilometres to measure large distances)
Kilometres are comparable to Miles. You can measure long distances such as the distance between two cities, etc. 1 kilometre equals 0,62 miles.
No. Kilometre is a measure of distance.
Speed. Kilometre measure distance, and hour is a measure of time. Distance / Time = Speed.
No. A hectare is a measure of are, a kilometre is a measure of distance. Conversion from one to the other is not valid.