2549

This number is a prime.

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The smallest center deletable prime formed by concatenating two double-digit squares. [Loungrides]

The only distinct-digit prime that is a concatenation of prime squares in two ways, i.e., (5^2, 2^2, 3^2) and (5^2, 7^2). [Loungrides]

The smallest prime concatenated from two successive prime squares is also the sum of three successive 3-digit primes, i.e., 2549 = 839 + 853 + 857. [Loungrides]