Is $4$ a complex number?

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Solution

Checking if $4$ is a complex number
A complex number is a number that is a combination of both the real part and the imaginary part. It is written in the form of $x + i y$ where $x, y$ are real numbers and $i$ is the imaginary part.
In case of $4$ , $x = 4, y = 0 .$
Therefore, there is no imaginary part in $4$ . There is only a real part.
Hence, $4$ is not a complex number.

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