Confusion related to gaussian

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I have this confusion related to gaussian distribution

Do we need to have something like $e^{-\frac{x^2}{2}}$ to be called gaussian or $e^{-{x^2}}$ is enough to be called Gaussian. I was reading this article related to gaussian integral and they don't even have the fraction 1/2 to be called gaussian. I mean it can be called gaussian function. But is it gaussian distribution?