The squares of which of the following would be odd numbers?

**(i)** 431

**(ii)** 2826

**(iii)** 7779

**(iv)** 82004

**(i)** The given number 431 being odd, so its square must be odd.

**(ii)** The given number 2826 being even, so its square must be even.

**(iii)** The given number 7779 being odd, so its square must be odd.

**(iv)** The given number 82004 being even, so its square must be even.

Hence, the numbers 431 and 7779 will have squares as odd numbers.