This number is a composite.
The largest integer expressed as (p1^p2)(p3^p4) where p1, p2, p3 and p4 are the primes 2, 3, 5, 7 in some order. [Smith]
The largest integer expressed as (p1^p2)(p3^p4) where p1, p2, p3 and p4 are the primes 2, 3, 5, 7 in some order. [Smith]