The prime factorization of the number at the top
two- digit modifier
It is called a twelve-digit number. Its exact name will depend on the number.
55 has factors other than 1 and itself, so it is not a prime number. For example, 55 is divisible by 5. (You can tell this because the last digit is a 5. If the last digit - the digit in the ones place - is a 5 or a 0, the number is divisible by 5.) Therefore, 55 is a composite number.composite
There is no name for numbers which are neither prime nor composite.
a prime factor
The only name is factorization.
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A prime number
factor tree
Squares (or cubes or more) of prime numbers have one distinct prime factor, but if you're counting them individually, all composite numbers have at least two prime factors.
The prime factorization of the number at the top
A prime number is any number that only has one and itself as factors. By definition even numbers have a factor of two. Therefore the only even number that is prime is the number 2.
The name "24-digit number" is just fine.The name "24-digit number" is just fine.The name "24-digit number" is just fine.The name "24-digit number" is just fine.
What is 36 single digit number
We generally refer to them by the number of digits. Two-digit number, three-digit number, etc.
Just that - a 26-digit number. There is no special name for that.