Which of the following are squares of odd numbers?
(1) 961
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Given:
- A number is given to us .
To Check:
- Whether it is square of odd number or not
Check:
Method 1:
First have a look at this table :
Now its clear that if the units digit is a odd number then the units digit after squaring is also a odd number .
So ,we are given with 961 which has its units digit as 1 ,which is odd number .
Hence we can conclude that it is square of a odd number.
Method 2:
Also this can also be found by taking out prime Factorisation of a given number .
Now 961 can be written as 31×31 .
So , √961 = √31×31 = 31 ,which is a odd number.
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