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No. For example, 5+5=10.
Only integers are even or odd. If a decimal is equal to an integer (for example 24.0 is equal to 24), then it can be even or odd. If a decimal is not equal to an integer (for example, 24.1 is not an integer), then it is neither even nor odd.
Yes for example 26/2 = 13 which is an odd number
Any product of two or more odd numbers that are larger than 1. For example, 33 = 3*11 is odd and composite.
Square numbers have odd numbers of factors. Examples: 4, 9, 16