Question

Which of the following is not a perfect square?

• A. $11025$
• B. $16384$
• C. $18496$
• D. $23857$

Answer 1

The correct option is D

$23857$

Explanation for correct options:

Option D.

A perfect square is a number that can be expressed as the product of an integer by itself or as the second exponent of an integer. The perfect square ends with numbers $1,4,6,9\mathrm{and}0$ in their unit place.

$23857$ is not a perfect square as non of the perfect squares end with a number $7$.

Hence, the correct Option is “Option D”.

Explanation for incorrect option:

Option A.

$11025=105\times 105$ It is a perfect square.

Option B

$16384=128\times 128$ It is a perfect square.

Option C.

$18496=136\times 136$ It is a perfect square.

Hence Option A, Option B, and Option C are incorrect options.

Hence, the correct Option is “Option D”.