A composite number is a positive integer that has more than two divisors, meaning it can be evenly divided by numbers other than 1 and itself.
To prove that a number is composite, you must show that it has at least three divisors. This can be done by finding two numbers other than 1 and itself that divide evenly into the number, or by showing that the number is a multiple of a prime number.
The formula for determining if a number is composite is to check if it has any divisors other than 1 and itself. If it does, then it is composite. If it only has 1 and itself as divisors, then it is a prime number.
To prove that 9999999+1999000 is a composite number, we can first simplify the expression to 11998999. Then, we can find two numbers that divide evenly into 11998999, such as 3 and 3999667. This shows that 11998999 has at least three divisors and is therefore a composite number.
No, a number cannot be both prime and composite. A prime number has exactly two divisors (1 and itself), while a composite number has more than two divisors. Therefore, a number cannot have both properties at the same time.