Yes, two is a Scrabble word!
...and is worth 6 points in Scrabble, and 6 points in Words with Friends
two
Adjective
1. Being one more than one
Noun
1. The cardinal number that is the sum of one and one or a numeral representing this number
2. One of the four playing cards in a deck that have two spots
What Scrabble words can I make with the letters in two?
3 Letter Words
2 Letter Words