Square of 17
17 squared equals 289. Squares appear in area calculations, the Pythagorean theorem, and statistics (variance uses squared distances).
Squares obey quiet rules. Divided by 9, a square only ever leaves 0, 1, 4 or 7 — 1 here. On the last digit, squares end only in 0, 1, 4, 5, 6 or 9, and 9 fits. Between its neighbors, 256 sits 33 below and 324 sits 35 above — the square ladder widens by exactly two at every step. An odd base keeps the square odd: 289 ends in an odd digit, as every odd square must. Two anchors most worth memorizing in this range are 12² = 144 and 15² = 225 — the odd-step rule above is why knowing them pays off, because from any anchor the next square is one step along this page's ladder.
| Expression | Value |
|---|---|
| 17² | 289 |
Frequently asked questions
What is 17 squared?
17 squared is 289, because 17 × 17 = 289. The exponent 2 is why it is written 17².
What is 18 squared, next to 17²?
18² = 324, which is 35 more than 17² = 289. Each step up adds double the base plus one.
Where do squares show up in real problems?
Area of a square with side 17, distance in the Pythagorean theorem, and variance in statistics all use squared values.