View Compilation Error

0_0_8063786_15665.cpp: In function `bool isPrime(int)':
0_0_8063786_15665.cpp:8: error: `sqrt' undeclared (first use this function)
0_0_8063786_15665.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8063786_15665.cpp: In function `int main()':
0_0_8063786_15665.cpp:22: error: `pow' undeclared (first use this function)