That is the 1-ball.
A yellow pool ball cannot have the number 2 on it. There are no pool games that use a yellow number 2 ball. A snooker ball can be yellow with a number 2 on it. The ball is most likely a snooker ball.
Nine ball (pool)
Ball number 1 in pool is the Sold Yellow ball.
yellow.
The eight ball is solid black.
Yellow.
In 8 ball pool there are 16 balls on the table, a cue ball, 8 ball, 7 solids and 7 stripes although they could be red and yellow etc. In 9 ball there are 10 balls on the table, cue ball, 1-7 solid, 8 ball and striped 9 ball.
The number 2 ball is a solid blue color.
8 ball pool, 7 solid, 7 stripes the 8ball and the cue ball. So 16.
there are 7 solid, 7 striped, 1 black 8-ball, and1 white cue ball.
Anyone that regularly plays any of the pocket billiards games, usually 8 ball or 9 ball, can be called a pool player.