73

This number is a prime.

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+ The smallest prime whose square (5329) is the concatenation of two multidigit primes. [Trotter]

+ 389 and 17 are primes, as is their concatenation (38917). Inserting the lowly 0 between them transforms the prime into a power, i.e. 389017, the cube of 73, a prime itself. [Trotter]

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