added snippet for checking if number is a prime

Author: Mcbencrafter

snippets/java/math/prime-check.md

@@ -0,0 +1,31 @@
+---
+title: Prime Check
+description: Checks if a number is a prime
+author: Mcbencrafter
+tags: math,number,prime
+---
+
+```java
+public static boolean isPrime(int number) {
+    if (number <= 1) 
+        return false;
+
+    if (number <= 3) 
+        return true;
+
+    boolean prime = true;
+    for (int divisor = 3; divisor < number; divisor++) {
+        if (number % divisor != 0)
+            continue;
+
+        prime = false;
+        break;
+    }
+
+    return prime;
+}
+
+// Usage:
+int number = 31;
+System.out.println(isPrime(number)); // true
+```