Common bleach is sodium hypochlorite (NaOCl). It is actually a strong base, which is the opposite of an acid. The effectiveness of bleach is due to the fact that it is a strong oxidizer.
Common household bleach is not acidic; it is a solution of approximately 3–6% sodium hypochlorite (NaClO). Normally it has a high pH, which would make it more basic.
No, bleach is not an acid. In fact, bleach is quite a strong base and is commonly used to counteract the effects of acid. The main active ingredient in bleach is HOCl.