This number is a composite.
7856 = 2^4 * 491 and its successor 7857 = 3^4 * 97 are each the product of a prime and the 4th power of a prime. [Post]
7856 = 2^4 * 491 and its successor 7857 = 3^4 * 97 are each
the product of a prime and the 4th power of a prime. [Post]