No, ‘his’ is not a proper noun. It is a possessive pronoun used to indicate that something belongs to or is associated with a male person or animal that has been previously mentioned or is easily identified in context.
Proper nouns, on the other hand, refer to specific names of people, places, organizations, or sometimes things. Examples of proper nouns include ‘John’, ‘Paris’, and ‘Apple Inc.’. Unlike proper nouns, which always start with a capital letter, ‘his’ is written in lowercase unless it begins a sentence.
In summary, ‘his’ serves a grammatical function in language as a pronoun, whereas proper nouns serve to identify specific entities.