No, not all zoom lenses are telephoto. The word telephoto applies to lenses with a greater focal length than that of our eyes. Our eyes are roughly equivalent to a 50mm lens, but the consensus is that the telephoto category of lenses starts around 70mm. There are plenty of zoom lenses that are not telephoto lenses. For example, wide zoom lenses can range from 11-40mm, and standard zoom lenses can range from 24-105, overlapping slightly into the telephoto range.