Calculate the max prime number in Go

maxPrime.go

import (
	"log"
	"math"
)

// Copied from https://www.geeksforgeeks.org/find-largest-prime-factor-number/
func CalculateMaxPrimeFactor(n int64) int64 {
	var maxPrime int64 = -1
	var i int64
	for n%2 == 0 {
		maxPrime = 2
		n >>= 1 // -> n/=2
	}

	for i = 3; float64(i) <= math.Sqrt(float64(n)); i += 2 {
		for n%i == 0 {
			maxPrime = i
			n = n / i
		}
	}
	if n > 2 {
		maxPrime = n
	}
	log.Println(maxPrime)
	return maxPrime
}