Which of these following integers is the square of an integer?  Choose the most appropriate option
A) 23122819142
B) 23306819348
C) 23714819407
D) 23235819489
E) 23871819863
The unit digit of any perfect square can not be 2, 3, 7, or 8.   The answer is 23235819489.
<result>D</result>
Which of these following integers is the square of an integer?