Any prime number is relatively prime to any other prime number.
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.
None, if a number is divisible by 210 then it is not a prime number!
Many prime numbers and many composite numbers.
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Infinity. There's an infinite number of place values, so you can create an infinite number of numbers that start with nine. Some of these will be prime, and since there is an infinite number of numbers starting with nine, there is an infinite number of prime numbers that start with 9 as well.
2011 is a prime number.
Infinitely many numbers are relatively prime to 37. Because 37 is a prime number, all other numbers are relatively prime to it.
Any prime number is relatively prime to any other prime number.
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.
Since there are infinitely many prime numbers, there can be no such number.
None, if a number is divisible by 210 then it is not a prime number!
Many prime numbers and many composite numbers.
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Look up a list of prime numbers (a Google search for "prime numbers" or "list of prime numbers" should do); every number (greater than 1) that is NOT a prime number is composite.
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.
Its prime factors are 2 and 431