Question

Which of the following numbers are perfect square?
A) 121
B) 1057
C) 23453
D) 7928
E) 222222

Answer 1

Hint:
This question is based on the concept of the square and the perfect square.
The number which multiplies with itself and gives the result in the form of a whole number then that number is called a perfect square.

Complete step by step solution:
A) 121 is a perfect square. Because if we multiply 11 with itself then we get 121.
B) 1057 is not a perfect square because if we multiply any number with itself, we did not get 1057.
C) 23453 is not a perfect square because if we multiply any number with itself, we did not get 23453.
D) 7928 is not a perfect square because if we multiply any number with itself, we did not get 7928.
E) 222222 is not a perfect square because if we multiply any number with itself, we did not get 222222.
Therefore, only 121 has a perfect square.

Note:
If the unit place digit of any number has one of the digits from 2, 3, 7 and 8 then, the perfect square of that number does not exist. because perfect squares are the numbers which are products of a number by itself.