Cracked corners of mouth, is it herpes?

Unlikely. Based on your description of 'cracked' lips, it's unlikely to be herpes. Furthermore, herpes is also unlikely to affect both corners of your mouth at the same time. You either have chronic dry lips, in which case the simple use of a lip balm daily would help. However, sometimes a fungal infection can also cause this. See you dentist. He or she can give a special medicine which help.