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Some numbers are prime numbers - some numbers have other properties.
You might think it's not important to know that 2, 4 and 6 are even numbers. This is true when doing simple calculations such as 6 + 3. Whether they are odd or even has little bearing on the sum. However, if you want to go into a career where a thorough understanding of math is vital ~ and there are plenty of them ~ you'll need to know a lot more about numbers than how to do basic calculations.
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