638
| Ngwagakete: | Ngwagakete 1 |
|---|---|
| Mengwagakgolo: | Ngwagakgolo 6 – Ngwagakgolo 7 – Ngwagakgolo 8 |
| Mengwagasome: | 600s 610s 620s – 630s – 640s 650s 660s |
| Mengwaga: | 635 636 637 – 638 – 639 640 641 |
638 (DCXXXVIII) ebile ngwaga wa go thoma ka Mošupologo, ngwaga wa bosenyane ngwagengsome wa 630s, ngwaga wa bomasometharo seswai ngwagengkgolo wa Ngwagakgolo 7, le ngwaga wa bomakgolo tshela masometharo seswai ngwagengkete wa Ngwagakete 1.