A Prime number has exactly two distinct factors whereas a composite number has more than two distinct factors.
Examples:
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A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
Prime numbers have two factors. Composite numbers have more than two.
The set of even numbers contains the prime number, 2. The set of composite numbers contains infinitely many odd numbers.
Rectangular numbers are a subset of composite numbers. The squares of prime numbers will be composite but not rectangular.
No, twin primes are pairs of prime numbers that have only one number between them which is a composite number. For example, (3, 5) and (11, 13) are twin prime pairs with the composite number 4 and 12 respectively between them.
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