Not necessarily. Square numbers don't.
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Incorrect. Square numbers are composite and have an odd number of factors.
Composite numbers can have either an odd number or an even number of fractions. Factors of 25 are 1, 5, 25 . (odd number of them) Factors of 26 are 1, 2, 13, and 26 . (even number of them)
572 is a composite number, because it is divisible by more than only 1 and itself. It is an even number and thus also divisible by 2. Its factors are 1, 2, 4, 22, 26 143, 286, and 572.All even numbers are composite, except for the number 2.
Not all prime numbers are odd. There is one prime number that is even: 2. A prime number is a number with two and only two factors: 1 (also known as unity) and itself. A composite number is a number with more than two factors. All even numbers are divisible by 2. Thus, all even numbers have 2 as a factor, which means that all even numbers greater than 2 have more than two factors, so they cannot be prime numbers.
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.