Is the newline character only for outputting strings or is it just my syntax?

Question

Total beginner, just going through the basic concepts.
cout <<"Hello World\n;" // this gives a new line just fine
int x=6;
cout <<x\n; // this doesn't work, nor any variations of it I've tried
int x=6
cout <<x<< endl; // this, of course, works just fine

Answer 1

'\n' is a char so you have to insert that into cout after x, so
cout << x << '\n';

Answer 2

or std::endl

Answer 3

What about a blank line?
int x = 6;
cout << x << '\n\n' ;
cout <<"New line";
// outputs '62570New line' for some reason