One of the best ways to verify that CloudyCluster is ready to run your important research investigations, is to run it through one the Sample Jobs built into the standard image. Samples that we have included have small data sets or task expectations, which give you quick assurances that the environment is ready to handle larger, more demanding workloads. The sample this article will walk through is using the Message Passing Interface or MPI and a very fast job to count the number of prime numbers between 0 and 25,000,000.