For whole numbers $x$ , consider: 'If $x^{2}$ is odd, then $x$ is odd.' Which of these is correct?

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More Truth of statements and their converses questions

For real $x$ , consider: *'If $x^{2} = 9$ , then $x = 3$ .'* Which of these is correct?
For whole numbers $n$ , consider: *'If $n$ is divisible by 4, then $n$ is even.'* Which of these is correct?
For real numbers $a$ and $b$ , consider: *'If $a$ and $b$ are both positive, then $ab$ is positive.'* Which of these is correct?
For real $x$ , consider: *'If $x > 2$ , then $x^{2} > 4$ .'* Which of these is correct?
For whole numbers $n \geq 2$ , consider: *'If $n$ is prime, then $n$ is odd.'* Which of these is correct?
For real $x$ , consider: *'If $∣ x ∣ < 2$ , then $x^{2} < 4$ .'* Which of these is correct?