How many of the 1000 whole numbers from 1 to 1000 are both even and the square of a whole number?
An even perfect square is produced by an even number. The smallest, being 2, which 2^2 = 4.
Then, the largest, being 30, which is 30^2=900.
Counting all of the even numbers from 2-30 yields your answer is A.15.