No, all matter is not made of electromagnetic radiation. Matter is composed of elementary particles, such as electrons, protons, and neutrons, which are fundamental constituents of atoms. These particles interact with each other through various fundamental forces, including the electromagnetic force.
Electromagnetic radiation, on the other hand, refers to the propagation of electromagnetic waves through space. It consists of oscillating electric and magnetic fields that can be described by classical electrodynamics or quantum electrodynamics.
While matter can interact with and emit or absorb electromagnetic radiation (such as photons), it is not fundamentally composed of electromagnetic radiation itself. Matter and electromagnetic radiation are distinct entities, with matter being composed of particles and electromagnetic radiation being a form of energy.
The behavior of matter is described by quantum mechanics and the Standard Model of particle physics, which involve various fields and particles interacting through different fundamental forces. Electromagnetic radiation is one aspect of the electromagnetic force, which plays a role in the interactions between charged particles, but it is not the sole constituent of matter.