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

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

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

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

A prime number has 2 factors; 1 and itself. 0 and 1 are neither prime nor composite, so the prime numbers are 2 and 3.

Prime numbers are numbers that have only 2 factors, 1 and itself. The number one is not prime or composite. Most prime numbers are odd. There is only one composite even number, 2.

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

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

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.

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.

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.

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.

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

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

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.

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

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.

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.