prove that root 3 is irrational ?

Question

prove that root of 3 is irrational number

Answer 1

https://www.grc.nasa.gov/www/k-12/Numbers/Math/Mathematical_Thinking/irrationality_of_3.htm

 

The above is a link to one of the several 'hits' when I googled "proof that square root of 3 is irrational."