diff --git a/Maths/KaprekarNumber.js b/Maths/KaprekarNumber.js
new file mode 100644
index 0000000000..a17cc2d1b6
--- /dev/null
+++ b/Maths/KaprekarNumber.js
@@ -0,0 +1,26 @@
+/**
+ * @function isKaprekarNumber
+ * @description A Kaprekar number is a positive integer whose square can
+ *   be split into two parts that add up to the original number.
+ *   For example, 9: 9²=81, 8+1=9. 45: 45²=2025, 20+25=45.
+ * @param {number} n - A positive integer
+ * @returns {boolean} - True if n is a Kaprekar number, false otherwise
+ * @see https://en.wikipedia.org/wiki/Kaprekar_number
+ * @example isKaprekarNumber(9) => true
+ * @example isKaprekarNumber(45) => true
+ * @example isKaprekarNumber(10) => false
+ */
+const isKaprekarNumber = (n) => {
+  if (!Number.isInteger(n) || n < 1) {
+    throw new TypeError('Input must be a positive integer')
+  }
+  const square = String(n * n)
+  for (let i = 1; i < square.length; i++) {
+    const left = Number(square.slice(0, i)) || 0
+    const right = Number(square.slice(i))
+    if (right > 0 && left + right === n) return true
+  }
+  return false
+}
+
+export { isKaprekarNumber }
diff --git a/Maths/test/KaprekarNumber.test.js b/Maths/test/KaprekarNumber.test.js
new file mode 100644
index 0000000000..edf9387e5f
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+++ b/Maths/test/KaprekarNumber.test.js
@@ -0,0 +1,51 @@
+import { isKaprekarNumber } from '../KaprekarNumber.js'
+
+describe('isKaprekarNumber', () => {
+  test('1 is NOT a Kaprekar number', () => {
+    expect(isKaprekarNumber(1)).toBe(false)
+  })
+
+  test('9 is a Kaprekar number (9²=81, 8+1=9)', () => {
+    expect(isKaprekarNumber(9)).toBe(true)
+  })
+
+  test('45 is a Kaprekar number (45²=2025, 20+25=45)', () => {
+    expect(isKaprekarNumber(45)).toBe(true)
+  })
+
+  test('55 is a Kaprekar number (55²=3025, 30+25=55)', () => {
+    expect(isKaprekarNumber(55)).toBe(true)
+  })
+
+  test('99 is a Kaprekar number (99²=9801, 98+01=99)', () => {
+    expect(isKaprekarNumber(99)).toBe(true)
+  })
+
+  test('297 is a Kaprekar number (297²=88209, 88+209=297)', () => {
+    expect(isKaprekarNumber(297)).toBe(true)
+  })
+
+  test('10 is NOT a Kaprekar number', () => {
+    expect(isKaprekarNumber(10)).toBe(false)
+  })
+
+  test('11 is NOT a Kaprekar number', () => {
+    expect(isKaprekarNumber(11)).toBe(false)
+  })
+
+  test('100 is NOT a Kaprekar number', () => {
+    expect(isKaprekarNumber(100)).toBe(false)
+  })
+
+  test('throws TypeError for zero', () => {
+    expect(() => isKaprekarNumber(0)).toThrow(TypeError)
+  })
+
+  test('throws TypeError for negative input', () => {
+    expect(() => isKaprekarNumber(-9)).toThrow(TypeError)
+  })
+
+  test('throws TypeError for float input', () => {
+    expect(() => isKaprekarNumber(9.5)).toThrow(TypeError)
+  })
+})