Determine if a given integer is odd. Return true if the number is odd, false if it's even.
Examples:
Input: num = 15
Output: true
Explanation: 15 divided by 2 has remainder 1, so it's odd
Input: num = 4
Output: false
Explanation: 4 is divisible by 2 with no remainder, so it's even
Input: num = 0
Output: false
Explanation: Zero is considered an even number
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