why does sqrt(2)^3= 2*sqrt(2) because sqrt(2)^2=4 then how does it continue from there? Please explain Thanks!

Note......  [sqrt(2)]^2  =  sqrt(2) * sqrt(2)  = 2     [ not 4 ]

And

[sqrt(2)]^3  =  sqrt(2) * sqrt(2) * sqrt(2)  =  2*sqrt(2)