No they are NOT! Armenians are Non-Chalcaedonian or Miaphysite (along with the Syrians, Indians, Copts, and Ethiopians/Eritreans) and were traditionally considered heretics by pre-modern, pre-ecumaniac Eastern Orthodoxy. Certainly they preferred Russian to Turkey during World War I, but the Armenian church hasn't been Eastern Orthodox since it rejected the Council of Chalcaedon.
Before I became a Noachide I worshiped for practically an entire summer in Armenian churches (both Catholic and Gregorian).
Now, the Georgian Orthodox Church is "Greek" Orthodox. But the Armenian Apostolic Church is not.
Thank you FRiend for correcting me. I cant remember why I assumed that most Armenians were Orthodox but it’s good to know the facts.