Leading and trailing zero's do not count as significant figures, ie. 0.00193857 still only has 6 significant figures.
Also, occasionally you may see a number with less than 6 significant figures, something like 345.4 or 23.1, this is really 345.400 and 23.1000 (respectively) but the extra zero's are removed by the game.
In fact, at the bottom of the editor you are able to see the [x,y,z] position of where your cursor currently is, this also exhibits this behavior.