No: Ammonium is a polyvalent cation that is not usually considered either an acid or a base. Ammonium hydroxide is a base that produces ammonium salts of the anions of an acid with which the ammonium hydroxide reacts.
When ammonium hydroxide decomposes, its ions are changed into two compounds. These two compounds are the same that ammonium hydroxide is formed from. Thus, ammonium hydroxide decomposes into water and ammonia.
A reaction of ammonia and water make ammonium hydroxide.I think ammonium hydroxide is a weak base. it has most of ammonia molecule because ammonia has a property of nucleophilic and same thing is done by the ammonium hydroxide.