fix: cleanup CheckKishnamurthyNumber (#1626)

Maths/test/CheckKishnamurthyNumber.test.js

@@ -0,0 +1,18 @@
+import { CheckKishnamurthyNumber } from '../CheckKishnamurthyNumber'
+
+describe('CheckKishnamurthyNumber', () => {
+  it.each([1, 2, 145, 40585])('returns true for %i', (num) => {
+    expect(CheckKishnamurthyNumber(num)).toBe(true)
+  })
+
+  it.each([0, 3, 4, 5, 100, 146, 1019823, -1])(
+    'returns false for %i',
+    (num) => {
+      expect(CheckKishnamurthyNumber(num)).toBe(false)
+    }
+  )
+
+  it('should throw when input is not a number', () => {
+    expect(() => CheckKishnamurthyNumber('2')).toThrowError()
+  })
+})