Dictionary · PPrime numberA whole number greater than 111 whose only factors are 111 and itself.Example2,3,5,7,112, 3, 5, 7, 112,3,5,7,11 and 131313 are prime; 9=3×39 = 3 \times 39=3×3 is not.Learn morePrime NumbersSee alsoFactorMultiple← PricePrincipal →