Question

Which of the following numbers surely is not a perfect square?
(a) 1764 (b) 729 (c) 4008 (d)256

Answer 1

Answer:

16384=128×128 (perfect square)

18496=136×136 (perfect square)

11025=105×105 (perfect square)

23857=1×23857 (prime no. so not a perfect square)

Hence, option B is correct

Answer 2

(a) 1764 is a perfect square of 42

(b) 729 is a perfect square of 27

(c) 4008 is not a perfect square ☑️

(d) 256 is a perfect square of 16