I am confused about calculating resistor voltage rating.

part no CRCW0402...C is having 0.063W power and voltage rating is 50V.

https://www.vishay.com/docs/28773/crcwce3.pdf

Let say resistance vale is 100 ohm, what is the maximum voltage this part can handle.

With above formula = V = SQRT(0.063*100) = 2.5V

So I am confused why they have given 50V in their specification.

Lets say i am using 100 in series with some other circuit.

Thanks in Advance !