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Just tell me the answer

I divided 19,708 , 19,807 , 19,780 , and 19870 by nine but none were divisible

Ok so this is homework question, i know it is supposed to be here but the math question would not go in any homewrok category i need help and my parents do not even know how to solve it. Math question: The population of Heidi's hometown is 18,079 people in 2006. In 2007 it was 19,087...