Prime and Composite Numbers

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

A composite number is a natural number greater than 1 that has more than two positive divisors.

4 is NOT a prime number.

2, 3, 5, 7, 11.

The smallest prime number is 2.

A factor is a number that divides another number without leaving a remainder.

The factors of 15 are 1, 3, 5, and 15.

No, 1 is not a prime number because it does not meet the definition of having exactly two distinct positive divisors.

The prime factorization of 18 is 2 x 3 x 3 or 2 x 3^2.

To determine if a number is prime, check if it has any divisors other than 1 and itself by testing divisibility with prime numbers up to its square root.