5077

This number is a prime.

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The largest prime whose square has its every digit occurring exactly twice: 5077² = 25775929.
Coincidentally, the smallest such prime is obtained by deleting a digit from 5077, i.e., 577. [Gudipati]

Submitted: 2026-03-01 04:43:21; Last Modified: 2026-04-18 15:37:45.