Is A a conjunction

Answer 1

No. A is an indefinite article.

"A" (or 'an') is the indefinite article, "the" is the definite article.

A conjunction connects words and clauses (and, but, or).

Answer 2

No, "A" is not a conjunction. It is the indefinite article used before nouns to indicate one of something or to refer to a non-specific item or thing.