No.
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To square a number means to multiply it by itself. Thus, 92 (read: nine squared, or nine to the second power) = 9 x 9=81
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nine
The number is spelled "two thousand nine hundred (and) twenty". The date would normally use the century convention, as "(the year) twenty-nine twenty".
Twenty-nine point six zero seven, or Twenty-nine point six tenths and seven hundredths.