or a stress fracture. you can try new shoes, icing and rest to solve this problem. if these don’t help, you will have to go to a doctor. it may be a stress fracture, so you will have to wear a medical boot for a couple of weeks. this page show the 256 prime list.
prime number index is from 255001 to 256000.
prime number list from 3573887 to 3588941, contain 1000 prime numbers.
3573887 is at position 255001, and 3588941 is at position 256000 in all prime list. 