Is 643 a prime number?

Is 643 a prime or composite number?

Answer: Number 643 is a Prime
643 - is a Prime Number because it has only 2 factors: 1 and 643 (itself)
Number should have exactly two factors to be classified as a Prime number
Since number 643 has exactly 2 factors - it is a Prime number

Prime numbers list

NumberIs Prime
628No
No
630No
Yes
632No
633No
634No
635No
636No
No
638No
639No
640No
Yes
No
Yes
644No
645No
646No
Yes
648No
No
650No
651No
652No
Yes
654No
655No
656No
657No

About "Is number a Prime" Calculator

This calculator will help you find out if a given number is Prime. For example, it can help you find out is 643 a prime or composite number? (The answer is: Yes). Enter number (e.g. '643') and hit the 'Calculate' button.
Prime numbers are the positive integers having only two factors - 1 and the number itself

FAQ

Is 643 a prime or composite number?

Number 643 is a Prime

How many factors are in a number 643?

2