An experiment is described and illustrated that may show that ordinary measurable photons are not fundamental/indivisible particles and rule out the non locality (and interaction free measurement) due to superposition of photons. Arrangements of Mach-Zehnder Interferometer apparatus are proposed for the investigation. Division at a half silvered mirror, into a part still detectable as a photon particle, the cut photon body, and a sub photon member is hypothesized. Three possible outcomes are described. Two of them support the notion of actual physical photon divisibility. One of the outcomes is not supportive of the notion. Some supplementary experiments are given for further investigation according to the outcomes found. Hope is expressed that this investigation is conducted by many institutions, so there is widespread consensus on the nature of photons. It is also hoped that this becomes a standard demonstration of that nature, whatever outcome is found.