Luke was not an Apostle but he wrote both the Gospel and Acts of the Apostles under the inspiration of the Holy Spirit. Both Luke and the Holy Spirit therefor say that Saul/Paul was a prophet.
Now in the church at Antioch there were prophets and teachers, Barnabas, Simeon who was called Niger, Lucius of Cyre’ne, Man’a-en a member of the court of Herod the tetrarch, and Saul. (Acts 13:1)
-Tim-