Answer:
(i) 431 \[\because \] 431 is an odd number \[\therefore \] Its square will also be an odd number. (ii) 2826 \[\because \] 2826 is an even number \[\therefore \] Its square will not be an odd number. (iii) 7779 \[\because \] 7779 is an odd number \[\therefore \] Its square will be an odd number. (iv) 82004 \[\because \] 82004 is an even number \[\therefore \] Its square will not be an odd number.
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