Question

a) Which of the following numbers is not a perfect square?
(i) 3,364
Yii) 1,024
(iii) 3,721
(iv) 2,207​

Answer 1

$i )Given \: number \: 3364$

$3364 = 58\times 58$

$= 58^{2} \:\blue{( Perfect \: square ) }$

$ii)Given \: number \: 1024$

$1024 = 32\times 32$

$= 32^{2} \:\blue{( Perfect \: square ) }$

$iii)Given \: number \: 3721$

$3721 = 61\times 61$

$= 61^{2} \:\blue{( Perfect \: square ) }$

$iv) Given \: number \: 2207$

$Unit \: place \: digit \: is \: 7$

$\therefore \red{2207 \: is \: not \: a \: perfect \: square }$

Rule:

The numbers that have 2,3,7 or 8 in the units place are not perfect square.

•••♪