isprime.go

package piscine

func IsPrime(nb int) bool {
	if nb < 2 {
		return false
	} else if nb == 2 || nb == 3 {
		return true
	} else if nb%2 == 0 {
		return false
	}
	for i := 3; i*i <= nb; i += 2 {
		if nb%i == 0 {
			return false
		}
	}
	return true
}