Yes. It's a natural number. All natural numbers are also integers, rational numbers, and real numbers.

If you mean real, as in something you can see or feel, well, sort of. A grain of table salt weighs about 0.1 mg, so a million of those weigh about 10 kg. That's about 13.5 of those round salt boxes sold in stores (737 g). Lifting 10 kg is easy, and that's a million of something you can see.

A billion would be about 13,500 boxes. Switching to American units, those are each cylinders a little under 3.5" in diameter and a bit under 5.5" high. You get exactly 13,500 boxes in a stack with a 30x30 box base stacked 15 boxes high. That's about 9'x9' of floor space, about 7' high. Way too much to carry, or even put in a pickup truck, but not that hard to visualize.