No, not all tablet pills are chewable; some are, and some aren't.
Some tablets are designed to be swallowed whole and may even have a special coating to prevent them from dissolving in the stomach. This coating ensures they dissolve only in the small intestine. However, "other tablets come in chewable forms," as stated in the reference, or as orally dissolving tablets (ODT), which break down in saliva. (20-Feb-2020)
Therefore, whether a tablet is chewable depends on its specific formulation.
