Question: Between what years did Jews increase to an estimated 2 million?
Answer: By the 1st century, Babylonia, to which Jews migrated to after the Babylonian conquest as well as after the Bar Kokhba revolt in 135 CE, already held a speedily growing population of an estimated 1,000,000 Jews, which increased to an estimated 2 million between the years 200 CE 500 CE, both by natural growth and by immigration of more Jews from the Land of Israel, making up about 1/6 of the world Jewish population at that era.
A single-select problem: Is the question answered in a satisfactory fashion?

(1). yes
(2). no
(1).