999999999
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999999999 times 999993 is 999,992,999,000,007
1x10153 times 999999999 is 999999999x10153. Normalizing that, you get 9.999999999x10161.
99999998900000001
999998999000001
999999999 is not a prime number because it has more factors than 1 and itself. It is obvious that 9 is one of its additional factors.