View Compilation Error

0_0_38379320_23152.cpp: In function 'int prime(int)':
0_0_38379320_23152.cpp:8:20: error: found ':' in nested-name-specifier, expected '::'
  for (i = 2; i <= k:i++) {
                    ^
0_0_38379320_23152.cpp:8:19: error: 'k' is not a class, namespace, or enumeration
  for (i = 2; i <= k:i++) {
                   ^
0_0_38379320_23152.cpp:8:24: error: expected ';' before ')' token
  for (i = 2; i <= k:i++) {
                        ^