200

This number is a composite.

The smallest number which cannot be changed into a prime by altering a digit. [Sierpinski]

Using the alphabet code (a = 1, b = 2, ..., z = 26), SOPHIE GERMAIN PRIME is disappointingly not prime. However, it is a composite with a factorization made solely out of Sophie Germain primes (2^3 * 5^2). [Reamy]