哲 is a bound form (b.f.) — it cannot stand alone as a word in modern Chinese. You will always see it as part of a compound, most commonly 哲学 (zhéxué, 'philosophy'), 哲理 (zhélǐ, 'philosophical principle'), and 哲人 (zhérén, 'sage'). The core meaning is 'wisdom' or 'philosophical insight', not directly 'wise' as an adjective.