Forest Bueller III said:
Yes and No. He is the Father of many nations, though he was Hebrew.
Historians mostly consider the Hebrews as synonymous with the Israelites, with the term "Hebrew" denoting an Israelite from the nomadic era, which preceded the establishment of the Kingdom of Israel and Judah in the 11th century B. C.
Abraham was from Ur Kasdim, commonly translated Ur of the Chaldees in English Bibles. However the Chaldeans did not occupy that site till 900 B. C., long after Abraham who lived around 2100-1800 B.C.
Ur has been excavated and it is a Sumerian site. Abraham was Sumerian. So although he has been called Hebrew twice, he was factually not Hebrew.
I was hoping to have more people answer the question just to get a sense of what people thought before diving into the historical discussion but we have two honest answers: "No" from Harrison and "Yes and no" from you and three who refuse to answer.