Is yourself a pronouns

Yes, the Word 'yourself' is a reflexive pronoun, a Word that 'reflects' back to the antecedent.

The reflexive pronouns are: myself, yourself, himself, herself, itself, ourselves, yourselves, themselves.

Example: I see that you made yourself some breakfast.

The reflexive pronouns also function as intensive pronouns when placed right after the antecedent. The intensive use is to emphasize the antecedent.

Example: I see that you yourself made some breakfast.