As 5prong mentioned, ginseng grows up from a single stalk or stem, that goes up and (in mature plants) will fork off in 2, 3, or 4 prongs (depending on maturity, health, etc).
Sometimes (rare) will have 5 or 6 prongs - but 3 prongs and 4 prongs are most common for healthy mature plants.
Where it forks off to the different prongs, it will have a flower spike (early spring) and the flowers turn into berries, green at first then turning red (starting about now).
Each prong will have (usually) 5 leaves on it, sometimes less, sometimes more (rare) - but most of the time each prong will have a cluster of 5 leaves on it.
Including 3 larger leaves that point out/away from the center, and 2 smaller leaves that point back towards the center.
That pattern (large leaves pointing out, small leaves pointing in) is what sets ginseng off. You have to be able to SPOT that pattern when scanning a area to distinguish it from something like Virginia Creeper.
Now take a look at this pic - same picture as above but with Seng plants identified.