Of Course they have to have other particles. Look for Quantum physics. you can see that they have quarks of variety. And the spins of them also important. Actually All sub atomic and atomic and the real life seen materials are some kind of energy.
Protons and Neutrons or made of quarks each proton or neutrons consist of 3 sub particles. uud, udd like that each has some char 2/3,1/3 etc if you want more info c the quantum physic and high energy physics books