diff --git a/Maths/UglyNumber.js b/Maths/UglyNumber.js
new file mode 100644
index 0000000000..c1e6cd678c
--- /dev/null
+++ b/Maths/UglyNumber.js
@@ -0,0 +1,26 @@
+/**
+ * @function isUglyNumber
+ * @description An ugly number is a positive integer whose prime factors
+ *   are limited to 2, 3, and 5.
+ *   Sequence: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12...
+ * @param {number} n - A positive integer
+ * @returns {boolean} - True if n is an ugly number, false otherwise
+ * @see https://en.wikipedia.org/wiki/Regular_number
+ * @example isUglyNumber(6) => true
+ * @example isUglyNumber(8) => true
+ * @example isUglyNumber(14) => false
+ */
+const isUglyNumber = (n) => {
+  if (!Number.isInteger(n) || n < 1) {
+    throw new TypeError('Input must be a positive integer')
+  }
+  let num = n
+  for (const factor of [2, 3, 5]) {
+    while (num % factor === 0) {
+      num = Math.floor(num / factor)
+    }
+  }
+  return num === 1
+}
+
+export { isUglyNumber }
diff --git a/Maths/test/UglyNumber.test.js b/Maths/test/UglyNumber.test.js
new file mode 100644
index 0000000000..d79ed63f7b
--- /dev/null
+++ b/Maths/test/UglyNumber.test.js
@@ -0,0 +1,55 @@
+import { isUglyNumber } from '../UglyNumber.js'
+
+describe('isUglyNumber', () => {
+  test('1 is an ugly number', () => {
+    expect(isUglyNumber(1)).toBe(true)
+  })
+
+  test('2 is an ugly number', () => {
+    expect(isUglyNumber(2)).toBe(true)
+  })
+
+  test('3 is an ugly number', () => {
+    expect(isUglyNumber(3)).toBe(true)
+  })
+
+  test('6 is an ugly number (2 x 3)', () => {
+    expect(isUglyNumber(6)).toBe(true)
+  })
+
+  test('8 is an ugly number (2³)', () => {
+    expect(isUglyNumber(8)).toBe(true)
+  })
+
+  test('15 is an ugly number (3 x 5)', () => {
+    expect(isUglyNumber(15)).toBe(true)
+  })
+
+  test('30 is an ugly number (2 x 3 x 5)', () => {
+    expect(isUglyNumber(30)).toBe(true)
+  })
+
+  test('14 is NOT an ugly number (2 x 7)', () => {
+    expect(isUglyNumber(14)).toBe(false)
+  })
+
+  test('7 is NOT an ugly number (prime > 5)', () => {
+    expect(isUglyNumber(7)).toBe(false)
+  })
+
+  test('11 is NOT an ugly number', () => {
+    expect(isUglyNumber(11)).toBe(false)
+  })
+
+  test('throws TypeError for zero', () => {
+    expect(() => isUglyNumber(0)).toThrow(TypeError)
+  })
+
+  test('throws TypeError for negative input', () => {
+    expect(() => isUglyNumber(-6)).toThrow(TypeError)
+  })
+
+  test('throws TypeError for float input', () => {
+    expect(() => isUglyNumber(6.5)).toThrow(TypeError)
+  })
+})