wat its prime number
http://www.mathsisfun.com/prime-composite-number.html
a prime number is a number that can only be divided by 1 and itself. for example: 3
A prime number is a positive integer greater than 1 that has no positive divisors other than 1 and itself. To determine if a number is prime, you can follow these steps:
1. Start with the number you want to check.
2. Take the square root of the number and round it down to the nearest whole number. This will give you the largest possible factor to check.
3. Divide the number by all the prime numbers less than or equal to the square root.
4. If any of the divisions result in a whole number, then the number is not prime. If none of the divisions result in a whole number, then the number is prime.
For example, let's check if 17 is a prime number:
1. Start with the number 17.
2. The square root of 17 is approximately 4.123, which rounds down to 4.
3. Divide 17 by the prime numbers less than or equal to 4: 2 and 3.
- 17 ÷ 2 = 8.5 (not a whole number)
- 17 ÷ 3 = 5.67 (not a whole number)
- There are no other prime numbers less than or equal to 4.
4. Since none of the divisions result in a whole number, 17 is a prime number.
In this case, the number 17 is a prime number because it has no divisors other than 1 and itself.