  We investigate integrality and divisibility properties of Fourier
coefficients of meromorphic modular forms of weight $2k$ associated to positive
definite integral binary quadratic forms. For example, we show that if there
are no non-trivial cusp forms of weight $2k$, then the $n$-th coefficients of
these meromorphic modular forms are divisible by $n^{k-1}$ for every natural
number $n$. Moreover, we prove that their coefficients are non-vanishing and
have either constant or alternating signs. Finally, we obtain a relation
between the Fourier coefficients of meromorphic modular forms, the coefficients
of the $j$-function, and the partition function.
