# What number is not a perfect square: 1280, 729 , 5329 or 3600?

Jul 6, 2015

sqrt(1280) =color(red)( 35.77 , so this is not a perfect square.

#### Explanation:

$\sqrt{729} = \sqrt{27 . 27} = 27$

$\sqrt{5329} = \sqrt{73 . 73} = 73$

$\sqrt{3600} = \sqrt{60.60} = 60$
The above all are perfect squares, whereas

sqrt(1280) =color(red)( 35.77 , so this is not a perfect square.