Yes 641 is a Prime number. You would need to check all the factors up to the square root of 641. So you need to look at all the possible prime factors up to 25. Some can be skipped such as 2 and 3.
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prime number or in simpler terms not divisible by any other number.
The prime factors are: 2, 641
As a product of its prime factors: 2*2*641 = 2564 or as 22*641 = 2564
30% of 641= 30% * 641= 0.3 * 641= 192.3
7 is a prime number!