Is itself an pronouns

Yes, the Word 'itself' is a reflexive pronoun.

The reflexive pronouns are Words that reflect back to the subject of the sentence or clause.

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

Example: The dog mad a bed for itself from the hay in the barn.

The reflexive pronouns also function as intensive pronouns, used to emphasize by placing the pronoun immediately following the noun they refer to.

Example: The dog itself dug a hollow in the hay for a bed.