11243...35329 (386-digits)

This number is a prime.

                                     112439 4165256367 4986498110 1001112112
1441316914 1961522516 2561728918 3241936120 4002144122 4842352924 5762562526
6762772928 7842984130 9003196132 1024331089 3411563512 2536129637 1369381444
3915214016 0041168142 1764431849 4419364520 2546211647 2209482304 4924015025
0051260152 2704532809 5429165530 2556313657 3249583364 5934816036 0061372162
3844633969 6440966542 2566435667 4489684624 6947617049 0071504172 5184735329

112439...735329 is a prime number composed of the digits 1 through 73 followed by their squares. Note that 73 is prime also. [Kulsha]