Seventy nine is the 22^{nd} prime number. It is an emirp, because the reverse of 79 is 97 which is also a prime number. The square root of 79 is equal to 8.88819

Seventy nine is the 22^{nd} prime number. It is an emirp, because the reverse of 79 is 97 which is also a prime number. The square root of 79 is equal to 8.88819

The nearest previous perfect square is 64 and the nearest next perfect square is 81 .