Question

show that square of any positive integer cannot be formed 6M + 2 or 6 m + 5 for any Integer m

Answer 1

let a be any positive integer
take b=6
then
a=6q+r, where r =0,1,2,3,4,5

now apply all values of r
and you will get 6 values of a
One by one square them and you will find your answer