Is owning a bullet dangerous without having a gun?

So I bought a bullet from this guy for a dollar and I just want to know if just owning a bullet without a gun is dangerous

Keep it far from heat, fire, lighters, fireworks... everything and anything at all that could set it off.

Never throw a bullet. If it lands on the butt end, the impact will discharge it the same as a firing pin. Also be aware that a bullet outside a weapon behaves much differently than when discharged in a weapon. Inside the weapon only the core is projected out of the barrel when discharged. When discharged outside a weapon, the jacket and the core separate and go in opposite directions at the same speed.

Many people have been seriously injured playing with bullets thinking they could launch them outside a weapon by tapping the jacket, shooting it with a BB gun or throwing them. For that reason store ammunition with the same caution you would store a loaded weapon. It has an equal capacity to do harm.