15211...64489 (116-digits)

This number is a prime.

                          152116 0016811764 1849193620 2521162209 2304240125
0026012704 2809291630 2531363249 3364348136 0037213844 3969409642 2543564489

The smallest googol prime formed from concatenation of n consecutive 4-digit square numbers (n=29). [Gupta]