53 is prime.
A prime number is a number divisible by only 1 and itself. A composite number is a number that is divisible by 1, itself and however many other numbers.
It’s important to note that 2 is the only even prime number (even = ends by a 0,2,4,6,8). Also, 1 is neither prime not composite.
To identify whether a number is prime or composite it helps to know your divisibility rules.
- Indicate whether the following numbers are prime or composite