In this paper we show that
every central simple algebra A over ℚp, generated by a multiplicative semigroup
S ⊂ A with the property that the minimal polynomial of every element
in S splits over ℚp, is isomorphic to Mn(ℚp). If, in addition, S ⊂ A∗ is a
compact group, then it contains a commutative normal subgroup of finite
index.