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Q: How many prime no is divisible only by it self and 1 but not by any other number?

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Just the one: 11 itself. If any other number were divisible by 11 that number would not be a prime.

None, if a number is divisible by 210 then it is not a prime number!

No prime numbers are divisible by 3. By definition a prime number isn't divisible by anything but itself and 1.

None. A number that ends with 8 is even, that is, divisible by 2. ================================ To be prime a number must only be divisible by itself and 1 thus any number divisible by 2 can not be a prime number. Therefore the answer to your question is:- "There are no prime numbers between 20 and 200 that end with an 8".

None. 12 is a composite and any number divisible by a composite is itself a composite.

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Just the one: 11 itself. If any other number were divisible by 11 that number would not be a prime.

None, if a number is divisible by 210 then it is not a prime number!

No prime numbers are divisible by 3. By definition a prime number isn't divisible by anything but itself and 1.

Just 7. Any other number divisible by 7 isn't prime.

No, it is divisible by 2,4 and many other numbers.

None. A number that ends with 8 is even, that is, divisible by 2. ================================ To be prime a number must only be divisible by itself and 1 thus any number divisible by 2 can not be a prime number. Therefore the answer to your question is:- "There are no prime numbers between 20 and 200 that end with an 8".

None. 12 is a composite and any number divisible by a composite is itself a composite.

By four prime numbers which are: 2 3 5 and 7

There are infinitely many prime numbers. There is only one even prime number, which is 2, because all other even numbers are divisible by 2 and thus are not prime. So, there are infinitely many odd prime numbers and only one even prime number.

4500 is not a prime number. In fact it has many numbers other than itself and 1 that divide into it. such as 450, 10, 50, 100, 25, 5, 2, etc-----------------------------------------------------------No even number can ever be a prime as it is divisible by 2.

No, there are many odd numbers that are not prime: 9, 15, 21, 25, 27, etc. However, 2 is the only even number that is prime, since all other even numbers are divisible by 2.

All of them??? There are probably infinitely many. Here are the first few numbers with 1 in the units place: 1: Not usually considered a prime number. 11: Prime 21: Not prime (divisible by 3) 31: Prime 41: Prime 51: Divisible by 3 61: Prime 71: Prime 81: Divisible by 3 91: Divisible by 7 101: Prime ...

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