I'm not sure how to answer this. The value displayed is dependent on the display you choose (2,143 steps displays as 2,1,43 in horizontal displays and as 2.1K steps in vertical displays).
If you're asking whether the tracker accurately counts your steps, I can't say. I see it count some arm movements as steps when I'm sitting, but my daily counts don't seem wildly out of line with other trackers or pedometers I have used. In any case, so long as you are tracking apples to apples (FitBit to Fitbit) you can see your relative activity levels without worrying if it's an "exact" count.