45
Chat with our AI personalities
The product of two prime numbers can never be another prime number, the numbers that you multiplied are factors of the product. (example, 9 times 5 is 45, 9 and 5 go into 45)
No. If the number by which you multiply 5 is even, the product will always end in "0" and will be even:5 x 2 = 105 x 8 = 405 x 18 = 90If the number by which you multiply 5 is odd, the product will always end in "5" and will be odd:5 x 3 = 155 x 9 = 455 x 31 = 155
2m + 9
-5
9 is the smallest natural number that is odd and composite: 9=3*3. 15 is the smallest natural number that is odd and a product of two numbers different from one and from each other: 15=3*5.