NO 44 is not a master number.
Only 11, 22, and 33 are considered master numbers by respected and well researched numerologists. Any number that repeats that is not a 1,2, or 3 (such as 44) is considered an energetically charged number compared to say 45 or 46.
The reason 11, 22, and 33 are the only actual Master numbers is that these numbers possess more potential than any other number.
If you or someone you know has a Master number, be aware that these are highly powerful numbers and require extra care to not only actualize their potential but also deal with the sometimes difficult to handle aspects of these Master numbers. Hope this helps!