reference for factorial completly randomised design
Yes. To prove it, you can take the square root of 2011 (about 44.8), and divide 2011 by all the prime numbers under this number. You'll see none of them divide, so it's prime.
A prime number is one that is only divisible by 1 and itself. Just work out if it divides into anything. To do this try dividing the number by all prime numbers under its half way value.
Because it is a product of real numbers. And the set of real numbers is closed under multiplication.
Prime Numbers under 6 are 2,3,5
the largest prime number under 100 is 97
The largest prime under 20 is 19.
There are 34 prime numbers under 140.
97 is the largest prime number under 100
The largest prime number under 200 is 199.
The prime numbers under 16 are 2,3,5,7,11 & 13.
The largest prime number under 10,000,000 is 9,999,991