Naw: Rhif
Rhif rhwng wyth a deg yw naw (9).
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| Enghraifft o'r canlynol | rhif naturiol, deficient number, rhif sgwâr, rhif cyfansawdd, odrhif, centered cube number, centered octagonal number, nonagonal number, non-negative integer, power of three, harshad number  |
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 Ffeiliau perthnasol ar Gomin Wicimedia | |
Mae 9 yn rhif cyfansawdd, gellir ei rannu gyda 1 a 3. Mae'n 3 gwaith 3 ac felly'r trydydd rhif sgwâr. Mae naw hefyd yn rhif Motzkin. Dyma'r rhif lwcus cyfansawdd cyntaf, ynghyd â'r odrif cyfansawdd cyntaf a'r unig odrif cyfansawdd un digid.
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