Which best describes √(16)?

Since $4^2=16$, we have $\sqrt{16}=4$. The number $4$ is a whole number, so it is an integer (and also a rational number, since $4=\frac{4}{1}$). The best description is that it is an integer, choice H. Choice F (irrational only) assumes every square root is irrational, but only the square roots of non-perfect squares, like $\sqrt2$, are irrational. Choice G (rational but not an integer) is wrong because $4$ is an integer. Choice J (undefined) is wrong because the square root of a positive number is always defined.