Data Sufficiency

IS N AN INTEGER?
(1) N^2 IS AN INTEGER
(2) SQRT(N) IS AN INTEGER

ANSWER IS B.

MY QUESTION IS , WHY CANT THE ANSWER BE D viz EITHER OF THE CHOICES.CANT WE ANSWER THIS QUESTION USING CHOICE (1) ALSO.
SEE BELOW

I FEEL IF N^2 IS AN INTEGER, THEN N HAS TO BE AN INTEGER. I CANT THINK OF ANY NON INTEGER VALUES WHOSE SQUARE IS AN INTEGER.

REQUESTING ALL THE SAVANTS OF GMAT QUANT TO HELP

Consider the sqroot(2), it is not an integer.

But sqroot(2)^2 = 2

Thus, n does not have to be an integer, it can be the square root of an integer

thanks, that what i call out of the box thinking