No, Abigail is not explicitly called a prophetess in the Bible.
While Abigail demonstrates wisdom and discernment, qualities sometimes associated with prophetic figures, the Bible never directly identifies her as a prophetess. The term "prophetess" is specifically used for women like Deborah, Huldah, Noadiah, Isaiah's wife, and Anna.
Abigail's story is found in 1 Samuel 25. She is described as intelligent and beautiful. She cleverly and diplomatically intervenes to prevent David from taking vengeance on her foolish husband, Nabal, and his household. Her actions and words are insightful and foreshadow David's future kingship, but these qualities, while impressive, don't automatically qualify her as a prophetess according to biblical usage. She is more accurately characterized as a wise and discerning woman who acted courageously to prevent bloodshed.