11.11
Although if you restrict yourself to integers, the answer is 22
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No.
No, 11 is the only palindromic prime with an even number of digits.
The next palindromic number after 1991 is 2002. A palindromic number reads the same forwards and backwards. In this case, 2002 reads the same whether you read it left to right or right to left.
36063 Then... 36163 36263
11