Which of the following is not the square of an integer? Choose the correct choice from the following:
A) 640828
B) 478864
C) 227529
D) 690561
E) 748225
The square of an integer (n^2) can have only the following units digit:   0, if the units digit of n is 0;   1, if the units digit of n is 1 or 9;   4, if the units digit of n is 2 or 8.   5, if the units digit of n is 5;   6, if the units digit of n is 6 or 4;   9, if the units digit of n is 3 or 7.   The square of an integer cannot have the units digit of 2, 3, 7, or 8.   The answer is 640828.
<result>A</result>
Which of the following is not the square of an integer?