An even number is a number that ends with either a 0, 2, 4, 6 or 8. Odd numbers end with either a 1, 3, 5, 7 or 9. It is just the last number that is important. For example, 353 is an odd number, while 844 is an even number.
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An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2.
To determine if a number is even or odd, you can check if the number is divisible by 2. If the number is divisible by 2 without leaving a remainder, then it is even. If the number is not divisible by 2 or leaves a remainder when divided by 2, then it is odd.
You can tell it will be even when the number you are multiplying has a 2 4 6 8. You can tell it will be odd when the number you are multiplying has a 1 3 5 7.
If the number (count) of odd values to sum is odd, then the answer is odd.If the number (count) of odd values to sum is even, then the answer is even.
You cannot. If a number is even - other than 2 - then it is a composite number. However, if it is odd, it is not easily possible to tell whether it is prime or composite.