We consider the lightest scalar meson in the frame of the SU L (2) × SU R (2) linear σ model, keeping in mind that this model could be the low energy realization of the two-flavour QCD. We show that the σ field is described by its four-quark component at least in the σ resonance energy (virtuality) region and the σ → γγ decay is the four quark transition. We emphasize that residues of the σ pole in the ππ → ππ and γγ → ππ amplitudes do not give an idea about the σ meson nature, and the progress in studying the σ meson production mechanisms in different processes could essentially further us in understanding its nature.