View Compilation Error

0_0_9888650_14460.cpp: In function `int main()':
0_0_9888650_14460.cpp:12: error: `prime' undeclared (first use this function)
0_0_9888650_14460.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9888650_14460.cpp: In function `int prime(int)':
0_0_9888650_14460.cpp:19: error: `int prime(int)' used prior to declaration