Question: Which has a greater population, Changchun or Huainan?

full_context: Document 1: Siping, Jilin: Siping (), formerly Ssupingkai (), is a prefecture-level city in the west of Jilin province, People's Republic of China. Located in the southwestern part of the province, in the middle of the Songliao Plain and at the intersection of Jilin, Liaoning and Inner Mongolia, Siping covers an area of 14,323 km2 . At the 2010 census, Siping has a total population of 3,386,325 while the urban population is 613,837.
Document 2: Fuyang:    () is a prefecture-level city in northwestern Anhui province, China. It borders Bozhou to the northeast, Huainan to the southeast, Lu'an to the south, and the province of Henan on all other sides.
Document 3: Shou County: Shou County or Shouxian () is a county in Anhui Province, China, under the jurisdiction of Huainan City. Its population is 1,280,000 and its area is 2986 square kilometers. It is a National Cultural and Historical City. the jurisdiction of Shou County was transfer from Lu'an to Huainan.
Document 4: Yanji: Yanji ("Yeon-gil" or "Yenji" in Korean, formerly romanized as Yenki) is a county-level city in the east of China's Jilin Province, and is the seat of the Yanbian Korean Autonomous Prefecture. Its population is approximately 400,000 of which a large portion is ethnic Korean. Yanji is a busy hub of transport and trade between China and North Korea.
Document 5: Hunchun: Hunchun is a county-level city in the Yanbian Korean Autonomous Prefecture, far eastern Jilin province, Northeast China. It borders North Korea (North Hamgyong province) and Russia (Primorsky Krai), has over 250,000 inhabitants, and covers 5,145 square kilometers. It was capital of Balhae/Bohai Kingdom between 785-793 as "Dongyang". The city's name Hunchun comes from the Manchu language meaning "borderland".
Document 6: Changchun: Changchun () is the capital and largest city of Jilin Province, and is located in the northeast of China. Lying in the center of the Songliao Plain, Changchun is administered as a , comprising 7 districts, 1 county and 2 county-level cities. According to the 2010 census of China, Changchun had a total population of 7,674,439 under its jurisdiction. The city's urbanized ("or metro") area, comprising 5 districts and 4 development areas, had a population of 3,815,270 in 2010 as the Shuangyang and Jiutai districts are not urbanized yet.
Document 7: Dehui: Dehui () is a county-level city under the jurisdiction of Changchun, the capital of Jilin province, People's Republic of China, located in the middle of the Songliao Plain. It has a total population of 906,000 and a rural population of 753,000. Composed of 10 towns, 4 townships and 4 subdistricts, under which there are 308 villages, it is around 80 km north-northeast of central Changchun. It borders Yushu to the northeast, Jiutai to the south, Kuancheng District to the southwest, Nong'an County to the west, as well as the prefecture-level cities of Jilin to the southeast and Songyuan to the northwest.
Document 8: Anhui: Anhui ( ; ) is a landlocked province of the People's Republic of China located in the eastern region of the country. Located across the basins of the Yangtze River and the Huai River, it borders Jiangsu to the east, Zhejiang to the southeast, Jiangxi to the south, Hubei to the southwest, Henan to the northwest, and Shandong for a short section in the north. The provincial capital is Hefei.
Document 9: Tonghua: Tonghua () is an industrial city in the south of Jilin province, People's Republic of China. It borders North Korea to the south and southeast, Baishan to the east, Jilin City to the north, Liaoyuan to the northwest, and Liaoning province to the west and southwest. Administratively, it is a prefecture-level city with a total population of 2,325,242 living in an area of 15195 km2 . Urban population is 506,877. It is known as one of the five medicine production centres in China.
Document 10: Shenyang: Shenyang ( ; ), formerly known by its Manchu name Mukden or Fengtian (), is the provincial capital and the largest city of Liaoning Province, People's Republic of China, as well as the largest city in Northeast China by urban population. According to the 2010 census, the city's urban area has 6.3 million inhabitants, while the total population of the Shenyang municipality, which holds the administrative status of a sub-provincial city, is up to 8.1 million. Shenyang's city region includes the ten metropolitan districts of Shenyang "proper", the county-level city of Xinmin, and two counties of Kangping and Faku.
Document 11: Handan: Handan () is a prefecture-level city located in the southwestern part of Hebei province, China. It borders Xingtai on the north, and the provinces of Shanxi on the west, Henan on the south and Shandong on the east. At the 2010 census, its population was 9,174,683 inhabitants whom 2,845,790 lived in the built-up ("or metro") area made of 3 urban districts, Handan and Yangyan counties, and Shahe City in Xintai municipality, largely being conurbated now.
Document 12: Lu'an: Lu'an (), is a prefecture-level city in western Anhui province, People's Republic of China, bordering Henan to the northwest and Hubei to the southwest. At the 2010 census, it had a total population of 5,612,590, whom 1,644,344 resided in the built-up area made of 2 urban districts. Neighbouring prefecture-level cities are the provincial capital of Hefei to the east, Anqing to the south, Huanggang (Hubei) and Xinyang (Henan) to the west, and Huainan and Fuyang to the north. Although the character "六 " (literally: "six") is normally pronounced "Liù", in this case it changes to "Lù" on account of the historical literary reading.
Document 13: Chuzhou: Chuzhou () is a prefecture-level city in eastern Anhui Province, China. It borders the provincial capital of Hefei to the southwest, Huainan to the west, Bengbu to the northwest, Chaohu to the south, and the province of Jiangsu to the east. According to the 2010 Census, the city of Chuzhou has a registered population of 3,937,868 inhabitants, whom 562,321 lived in the built-up ("or metro") area made of 2 urban districts. Nevertheless, 7,260,240 persons declared to be permanent residents.
Document 14: Huai'an: Huai'an (), formerly called Huaiyin () until 2001, is a prefecture-level city in central Jiangsu province of Eastern China. It borders Lianyungang, Suqian to the north, Yancheng to the northeast, Yangzhou to the southeast, and Chuzhou (Anhui) to the southwest.
Document 15: Huainan: Huainan () is a prefecture-level city with 2,334,000 inhabitants in central Anhui Province, People’s Republic of China. It borders the provincial capital of Hefei to the south, Lu'an to the southwest, Fuyang to the west, Bozhou to the northwest, Bengbu to the northeast and Chuzhou to the east.
ground_truth: Changchun