This number is a prime.
Concatenating the 4th powers of two consecutive primes of the form 6n-1 (i.e., 11^4 and 17^4) is a prime of the form 6n-1. [Bajpai]
Concatenating the 4th powers of two consecutive primes of
the form 6n-1 (i.e., 11^4 and 17^4) is a prime of the form
6n-1. [Bajpai]