  We introduce a new concept of dissipative measure-valued martingale solutions
to the stochastic compressible Euler equations. These solutions are weak in the
probabilistic sense i.e., the probability space and the driving Wiener process
are an integral part of the solution. We derive the relative energy inequality
for the stochastic compressible Euler equations and, as a corollary, we exhibit
pathwise weak-strong uniqueness principle. Moreover, making use of the relative
energy inequality, we investigate the low Mach limit (incompressible limit) of
the underlying system of equations. As a main novelty with respect to the
related literature, our results apply to general nonlinear multiplicative
stochastic perturbations of Nemytskij type.
