I think the actual number was probably in the tens or maybe even in the hundreds of thousands. According to this somewhat dodgy site - http://www.keikyo.com/keikyo/martyrs.html - they claim "nearly one million".
The same site also uses the term "Holocaust" which will no doubt incur the wrath of the Wiesenthal Center who zealously attack anyone who dares to affix the Holocaust label on anything other than their Holocaust. As Abba Eban once said "There is no business like Shoah business ..."