The given statement is

$"If\: a\:natural\:number\:is\:odd,\: then\:its\:square\:is\:also\:odd."$

Five different statements conveying the same meaning are

1. A natural number is odd only if its square is odd.

2. A natural number is odd implies that its square is odd.

3. If the square of a natural number is not odd then the number is also not odd.

4. For the square of a natural number to be odd it is sufficient that the number is odd.

5. For a natural number to be odd it is necessary that its square is off