6959

This number is a prime.

6959 is the only four-digit prime whose last three digits are 959; and likewise 6961. Note that they are twin primes. [Ikemoto]

The prime 6959 is featured as a prime factor in the largest amicable pair of numbers found by Euler. Ref: "History of the Theory of Numbers", Volume 1, Divisibility and Primality by Leonard E. Dickson, p.46, published by the Carnegie Institution of Washington in Washington DC in 1919.