In the same sense that any object that can potentially kill someone (hint: everything) is a weapon. Which is technically correct but a useless observation.
If we use a more narrow definition of weapon, e.g. a tool optimized for the primary purpose of injuring or killing people then it certainly is not a weapon.
If we use a more narrow definition of weapon, e.g. a tool optimized for the primary purpose of injuring or killing people then it certainly is not a weapon.