0
or if it's a trick question about the years going back, 1BC
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Not sure about a square route, but the square root of 654321 is 808.901 (to 3 dp).
720
The next number could be 26 The next number could be 12 - - - - - - - - - The next number that is in the sequence is 12.
What is the next number after a trillion? Its Quadrillion
The next square number after 16 is 25