foo.cc:1:2: error: stray '#' in program
    1 | i#nclude <cmath>
      |  ^
foo.cc:1:1: error: 'i' does not name a type
    1 | i#nclude <cmath>
      | ^
foo.cc: In function 'int main()':
foo.cc:6:2: error: 'cin' was not declared in this scope
    6 |  cin >> n;
      |  ^~~
foo.cc:9:3: error: 'cout' was not declared in this scope
    9 |   cout <<"No";
      |   ^~~~
foo.cc:13:23: error: 'sqrt' was not declared in this scope
   13 |  for (int i = 2; i <= sqrt(n); i++)
      |                       ^~~~
foo.cc:23:3: error: 'cout' was not declared in this scope
   23 |   cout <<"No";
      |   ^~~~
foo.cc:27:3: error: 'cout' was not declared in this scope
   27 |   cout <<"Yes";
      |   ^~~~

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