Question: What is the population of the largest city in Iraq, who's 1956–57 Iraq FA Cup Championship was open to teams from the capital?
Sentence (from "Baghdad"): The population of Baghdad, as of 2016 , is approximately 8,765,000, making it the largest city in Iraq, the second largest city in the Arab world (after Cairo, Egypt), and the second largest city in Western Asia (after Tehran, Iran).
Relevant evidence: Yes