If it ends in a 1, 3, 5, 7, or a 9
E.g.
731 is odd since it ends in 1
204940 is even since it ends in 0
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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.
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.
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 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.
No, 240 is an even number. You can always tell an even number because it can be divided by 2 equally. Odd numbers such as "7" cannot.