Determine if a given integer is a prime number. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
Examples:
Input: num = 7
Output: true
Explanation: 7 is only divisible by 1 and 7
Input: num = 12
Output: false
Explanation: 12 is divisible by 2, 3, 4, and 6
Input: num = 2
Output: true
Explanation: 2 is the smallest prime number
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