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Why is the number 2 so special?

Updated: 4/28/2022
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8y ago

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It is the only known even Prime number which makes 2 very special.

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Q: Why is the number 2 so special?
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What is things special about the number 2?

The number 2 is 'special' because it is the only prime number that is even.


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How do you check whether a number is special number or not by Java?

It depends what you regard as being "special". Once you define the criteria for "special" you can formulate an algorithm that determines whether or not a given number meets that criteria. For instance, if you regard prime numbers as being special, you need a predicate to test whether a given number is zero, prime or composite. If prime then it is indeed special, otherwise it isn't. A predicate is a function that returns true or false depending on its input(s). As a simple example, if we regard even numbers as being special, then we need to test if the number has the prime factor 2. If so, it is special, otherwise it is not. We can test this by dividing the number by 2 and testing the remainder. If the remainder is zero, the number is even and is therefore special. We use the modulo operator (%) to determine the remainder after integer division: bool is_even (int n) { return (n % 2) == 0; }


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