It means the number of x intercepts is 2.
You can also use Desmos.com to check by keying this in, and you will notice it crosses the x-axis two times.
For discriminant understanding,
if > 0, there are 2 real solutions (which you found)
if = 0, then there is only 1 real solution (this means the graph touches the x-axis
if < 0, then there are 2 imaginary solutions, which means the graph does not cross or touch the x-axis.