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Including both 25 and 453, the answer is 84747.
No, some composite numbers are odd. The smallest composite odd numbers are 9, 15, 21, 25, and 27. Not all even numbers are composite either. There's only one even number that's prime, which is 2.
The sum of all integers between 1 and 25 is equal to (25 x (25 - 1))/2 = 325.
25 and 54 are composite.
The only prime number in that range is 29. All others are composite.