Main.c:3:1: error: unknown type name 'bool'
    3 | bool is_prime(int n) {
      | ^~~~
Main.c:2:1: note: 'bool' is defined in header '<stdbool.h>'; did you forget to '#include <stdbool.h>'?
    1 | #include <stdio.h>
  +++ |+#include <stdbool.h>
    2 | 
Main.c: In function 'is_prime':
Main.c:4:24: error: 'false' undeclared (first use in this function)
    4 |     if (n <= 1) return false;
      |                        ^~~~~
Main.c:4:24: note: 'false' is defined in header '<stdbool.h>'; did you forget to '#include <stdbool.h>'?
Main.c:4:24: note: each undeclared identifier is reported only once for each function it appears in
Main.c:5:24: error: 'true' undeclared (first use in this function)
    5 |     if (n <= 3) return true;
      |                        ^~~~
Main.c:5:24: note: 'true' is defined in header '<stdbool.h>'; did you forget to '#include <stdbool.h>'?
Main.c:11:1: warning: control reaches end of non-void function [-Wreturn-type]
   11 | }
      | ^