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11
2 is the exception to the rule that every prime number is odd
The rule to decide if a number is divisible by 9 is to look at the sum of the digits. If the sum of the digits is divisible by 9, then so is the number.
There is no rule 11. I've seen the movie about 30-40 times and I know all the rule but there is no 11.
If the number is even, it's divisible by 2.