Strobogrammatic.

PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8]

Primality testing (6*10^(6254+10)+6881691889)*10^(6254+1)+9
[N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 11
Running N+1 test using discriminant 23, base 1+sqrt(23)
(6*10^(6254+10)+6881691889)*10^(6254+1)+9 is Fermat and Lucas PRP!

To be completed...