Question: are electromagnetic waves made of photons?
Answer: All electromagnetic waves, from radio waves with wavelengths L~km to gamma-rays with L~10e-12 m (i.e. 1 picometre, or 1 pm), are made up of bundles of energy called `photons'. ... So EM radiation can show `classical' wave-like properties in some situations, and `classical' particle-like properties in others.