The only number that matches the number of letters it has. Four letters for the number 4.
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One thing that is special is that 2 + 2 = 2*2 = 2^2 = 4
The number 2 is 'special' because it is the only prime number that is even.
Even though there are different special numbers, there is only one special number that falls under all the categories. The number one is special because it cannot be a prime or a composite number as one only has one factor: itself. So it is classified as a special number. There are, however, other special numbers in separate categories.
It is a composite number because it has more than two factors It is a square number because 4*4 = 16 It can be expressed as 1.6*101 in standard form It can be expressed as XVI in Roman numerals It is a rational number It can be expressed as 16/1 as a fraction It can be expressed as 16.0 as a decimal
It is the only known even prime number which makes 2 very special.