Technically, yes. Realistically, no, because it's not the sort of crack that will make the back shatter; the crack is, somehow, under the surface glass. On my phone, it's entirely cosmetic — it knocks the resale value down, but that's about it.

Fun fact: my phone took its dive after the crack. No water got in at all.

Calling it a crack when it's made with crack-resistant glass doesn't give the right impression of how undamaged it really is, compared to one's expectation that it shattered into a million pieces and embedded itself into my carpet like grenade shrapnel — it ain't like that.