Is 57 a prime number

To be sure, prime numbers are a number which cannot be divisible by every number except for itself and one. Take 5 for an example. There is no possible number which is divisible by itself except for itself and one. So, 5 is a Prime number.2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 are all prime numbers to 100. Let's refresh our mind. Now, 57 has factors of 1, 3, 19, and 57. Let's remove the 57 and 1. Now, 3 and 19 are all the factors of 57.