Step 1: The sutra works for squares of numbers ending in 5. Split the number: 65 = 6 | 5. Step 2: Take the digits before 5, i.e. 6, and multiply by "one more than itself" (ekadhika): 6 × 7 = 42. Step 3: Write 25 at the end (because 5² = 25). Step 4: Join the parts: 42 | 25 = 4225. Step 5: Check by ordinary multiplication: 65 × 65 = 4225 ✓. Answer: 4225.