Let m be given.
Assume Hm.
Let n be given.
Assume Hn.
rewrite the current goal using mul_nat_com m (omega_nat_p m Hm) n (omega_nat_p n Hn) (from left to right).
We will prove divides_nat n (n * m).
An exact proof term for the current goal is divides_nat_mulR n Hn m Hm.