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9 would be the Prime number because it can only be divided by 1 and itself.

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It's 4

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Q: Which of these numbers is a prime number 1 2 4 or 9?
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Related questions

Are 1 and 2 prime numbers?

2 is a prime number. 1 is not a prime number


Is there an Infinate number of prime numbers?

The number or prime numbers in infinite. Prime numbers can only be divided by 1 and the prime number itself. If you multiply all known prime numbers (you must not leave out any of them) and add 1 to the product the result is another prime number. E.g. 2 * 3 + 1 = 7 (prime) 2 * 3 * 5 + 1 = 31 (prime) 2 * 3 * 5 * 7 + 1 = 211 (prime) ... infinity


Is the product of 2 numbers a prime number?

The product of two numbers could be either a composite number or a prime number. If one of those numbers is 1 and the other is a prime number, the result is that prime number. If neither number is 1, the product of the two numbers will be a composite number. If one of those numbers is 1 and the other is not a prime number, the product will not be a prime number. So, in most cases, it will be a composite number.


Two prime numbers greater than 2 have 2 as a common factor?

No prime number greater than 2 has 2 as a factor. A prime number has only two factors, 1 and the number itself. All prime numbers have 1 as a common factor. Numbers with any number besides 1 as common factors are composite numbers.


What is true about prime number?

Here are some facts about prime numbers:1. Prime numbers have exactly two factors - 1 and the prime number itself.2. The only even number that is prime is 2.3. There are an infinite number of prime numbers.4. Every number can be uniquely represented as a prime number or a product of prime numbers.


Define prime numbers?

A prime number is a number in the set of positive integers such that it is only divisible by 2 unique numbers: itself, and 1. For this reason the first prime number is 2, not 1.


What fraction represents the number of prime numbers from 1-20?

2/5 of the numbers from 1 to 20 are prime numbers


What are the even prime numbers 1-100?

There is only one even prime number, the number 2.


Is 11 a prime number of 22?

A prime number is a number that is only divisible by 2 numbers, 1, and itself. So 11 is a prime number because it is only divisible by 2 numbers, but you wouldn't say it is a prime number of 22. There are no prime numbers of a number.


What do you get when you multiply 2 prime numbers?

A composite number. (If they are different numbers, keep in mind 1 is not a prime number)


Why are the numbers 1 and 2 not prime numbers?

The number 1 is not, given the definition of a prime number. This is because a prime number has exactly two factors, itself and 1. The number 1 has only one factor: 1. This allows us to use "prime" as a defining aspect of an integer. Likewise, the number zero is not a prime.The number 2 is a prime number. It has factors 1 and 2.


Which of the following are prime numbers 1 2 6 9?

1 and 2 are prime numbers.Another Answer:-It is only 2 that is a prime number because 1 is not considered to be a prime or composite number.