(i) We know that,

According to the property of squares, the square of an odd number is an odd number

The given number is ending with the digit 4 which is an even number

Thus, this number is not the square of an odd number.

(ii) We know that,

According to the property of squares, the square of an odd number is an odd number

The given number is ending with the digit 1 which is an odd number

Thus, this number is the square of an odd number.

(iii) We know that,

According to the property of squares, the square of an odd number is an odd number

The given number is ending with the digit 6 which is an even number

Thus, this number is not the square of an odd number.

(iv) We know that,

According to the property of squares, the square of an odd number is an odd number

The given number is ending with the digit 9 which is an odd number

Thus, this number is the square of an odd number

(v) We know that,

According to the property of squares, the square of an odd number is an odd number

The given number is ending with the digit 5 which is an odd number

Thus, this number is the square of an odd number