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Q: How is a number supposed to be prime?

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yes you are supposed to circle the prime#s and divide the composite

how am i supposed to kno do u think i am like magic or something ????

a factor is a factor , a prime number is a prime number, but a prime factor is a factor which is a prime number. it has to depend on what number number. exp 13 is a prime number

You is called a prime number!You is called a prime number!You is called a prime number!You is called a prime number!

If it is unknown, how are we supposed to know it? There must be a least unknown prime, so the next prime below that must (?) be known, sap pk. The next prime, pk+1 , must be the least unknown prime - so what is it, approximately?

No.

180 is not a prime number.

Prime.167 is a prime number.

37 is an odd prime number

A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.

No, it is not a prime number.

No, it is not a prime number.

prime

It is a prime number.

It is a prime.

Euclid (c. 300 BC) was one of the first to prove that there are infinitely many prime numbers. His proof was essentially to assume that there were a finite number of prime numbers, and arrive at a contradiction. Thus, there must be infinitely many prime numbers. Specifically, he supposed that if there were a finite number of prime numbers, then if one were to multiply all those prime numbers together and add 1, it would result in a number that was not divisible by any of the (finite number of) prime numbers, thus would itself be a prime number larger than the largest prime number in the assumed list - a contradiction.

19 is a prime number.19 is a prime number.19 is a prime number.19 is a prime number.

This is impossible. A prime number is defined as a number that is only divisible by one and itself. Thus, a 'prime' number capable of being divided by another prime number is by definition not a prime number.

Prime number next to any prime number is called consecutive prime number. Eg:- 2,3,5,7 are prime numbers

49 is not a prime number. It is the square of the prime number 7.

373 is a prime number.

No, never. It would be divisible by the prime number.

8243 is a prime number, but there is no greatest prime number.

21 is a composite number, not a prime, having prime factors 3x7.

3 is a prime number.4 is not a prime number. It is a composite number.