easy problem

You do not even need to look at the first part about "a". They just asked what 2 squared was. 2^2=2*2=4

$2 \times 2 = 4$

why did you mentioned it needs brain, Is brain a Calculator, when we need it we use it and when we don't want it we don't use it?

$(2)^2$ $\implies 2 \times 2 = 4$

(2) square is = 4. 2x2=4 2x2=square root 16

2 squared is 4

Actually it was an iq question which says a has 3 values ie 1 0 n -1 and in variable it has a value of squareroot(squareroot(a)) thus 2 square remains the same it needed a bit iq