Twenty-nine is a prime number, as its only divisors are 1 and 29. A prime number is defined as a whole number that is greater than 1 and is not evenly divisible by any other numbers except 1 and itself.
The next smallest and largest prime numbers are 23 and 31, respectively. All whole numbers greater than 1 that are not prime are considered "composite" numbers. For example, 28 is composite since it is also divisible by 2, 4, 7 and 14. The same can be said about 30, which is not a prime because it may be evenly divided by 2, 3, 5, 6, 10 and 15.