int is_prime(int n)

{

if (n <= 1) return 0;

if (n % 2 == 0 && n > 2) return 0;

**for (int i = 3; i < n / 2; i += 2)
if (n % i == 0)
return 0;**

return 1;

}

What do the three lines in this function mean?

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