99999...99999 (225-digits)
This number is a prime.
99999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999999999
9999999999 9999999999 9999999599 9999999999 9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999999999
The only near-repdigit square-congruent prime of order 15. [Loungrides]
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