Because they only have one factor pair.
Prime numbers have only two factors.
Prime numbers are numbers that have only 2 factors, 1 and itself. The number one is not prime or composite. Most prime numbers are odd. There is only one composite even number, 2.
Numbers with only two factors, the number itself and one, are called prime numbers. Examples of prime numbers are 2 (which is the only even prime number) and 17.
Prime numbers only have one and themselves as factors.
Since prime numbers only have one prime factor (themselves), they don't have prime factorizations.
They only have one array.
1,7,11,Well, it depends on what you mean by 'the array of a number'. If it has something to do with the divisors, then it's the primes, or the powers of primes.
Prime numbers.
Prime numbers have two factors. One only has one.
Prime numbers have only two factors.
Prime numbers are numbers that have only 2 factors, 1 and itself. The number one is not prime or composite. Most prime numbers are odd. There is only one composite even number, 2.
Numbers with only two factors, the number itself and one, are called prime numbers. Examples of prime numbers are 2 (which is the only even prime number) and 17.
If you can arrange the counters in the shape of a rectangle with at least two in each row and each column then the number is composite. The numbers of row and the numbers of columns are factors of the given number. If the only rectangle you can make is the "degenerate" one, with only one row or only one column, then the number is prime.
Prime numbers only have one and themselves as factors.
One conclusion about prime numbers is that prime nbumbers are numbers divisible only by 1 and by the number itself.
Since prime numbers only have one prime factor (themselves), they don't have prime factorizations.
There is only one even prime number: 2. All other even numbers have 2 as a factor, in addition to 1 and themselves, so they cannot be prime numbers.