[Golang] Primality Test - Optimized School Method

package main

import (
      "fmt"
)

func IsPrime(n int) bool {
      // Corner cases
      if n <= 1 {
              return false
      }
      if n <= 3 {
              return true
      }

      // This is checked so that we can skip
      // middle five numbers in below loop
      if n%2 == 0 || n%3 == 0 {
              return false
      }

      for i := 5; i*i <= n; i = i + 6 {
              if n%i == 0 || n%(i+2) == 0 {
                      return false
              }
      }

      return true
}