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# What number is both a prime number and a multiple of 3?

012 ###### 2012-09-03 08:26:07

No number that is a multiple of 3, can be a Prime number.

A prime number must only be divisible by itself and 1. It cannot be divisible by any other number.

Therefore if it is a multiple of 3, then it must be divisible by 3 and hence, not a prime number.

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## Related Questions Of course. There is 3. Remember, multiples of 3 can also be divided by 3, so the only prime number that is a multiple of 3 is 3. Yes, 3 is a prime number. Any other multiple of 3 can't, because the only factors of a prime number are 1 and the number. 2 and 3 are prime numbers 48 is a multiple of.    21 is composite number that is a multiple of 3. 31 is a prime number. One two digit number that is not prime and is not a multiple of 2, 3, or 5 is 49. Another such number is 91.  A prime multiple is when a number is expressed as the product of its prime factors as for example: 2*3*5*7 = 210 987 is a composite number that is a multiple of 3.   Any multiple of 3 will not be relatively prime to 9 because they will both have 3 as a common factor. Some of these numbers are 3, 6, 12, 39, 102, and 372. 36,201 is not a prime number because 3 is one of its factors. 3 is one of the factors of any number whose digits add up to 3 or a multiple of 3. The only prime number with 3 as one of its factors is the number 3. Yes as for example it can be a multiple of 1 because 1*3 = 3    No.3 is less than 5, thus cannot be a multiple of it; 3 is prime, therefore cannot be a multiple of any number besides 3 (which is one of its factors); by definition, 3 is ismply not a multiple of any number but 1 and 3. It's an odd number so it obviously can't be divided by 2. The sum of its digits (1+6+5) is a multiple of 3, so the number itself is a multiple of 3. So it's not prime. 1617 is not a prime number. The sum of its digits is a multiple of 3, so 3 is one of its factors. A prime number has exactly two factors, 1 and the number itself, so 1617 is a composite number.  The number is 42 or any multiple of 42. All of the qualifiers mean the same thing : the number is a multiple, of 2, 3, and 7. Using the Least Common Multiple: 2 is prime, power is 1 3 is prime, power is 1 7 is prime, power is 1 2 x 3 x 7 = 42 The answer is 9. It is a multiple of 3. 3+3+3=9. It is less than 20: 20-9=11.It is not a prime number. It is odd, and it is not a factor of 30. 30/9=3.3333333333

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