8

This number is a composite.

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The absolute difference between two odd prime squares is always a multiple of 8. [Capelle]

8 is the smallest composite number which can be represented as sum of two primes (i.e., 3 + 5) as well as sum of two composite numbers (i.e., 4 + 4). [Capelle]

The number of autobiographical primes is composite, but the number of autobiographical composites is prime. [Capelle]