feat: add IsPrime

mathutil/mathutil.go

@@ -240,3 +240,19 @@ func PointDistance(x1, y1, x2, y2 float64) float64 {
 
 	return math.Sqrt(c)
 }
+
+// IsPrimes checks if number is prime number.
+// Play: todo
+func IsPrime(n int) bool {
+	if n < 2 {
+		return false
+	}
+
+	for i := 2; i <= int(math.Sqrt(float64(n))); i++ {
+		if n%i == 0 {
+			return false
+		}
+	}
+
+	return true
+}