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Sagot :
Yes, it can only be divided by itself and 1. What I mean is for example. 3 is a prime. You can divide it by 3 and 1 to get a whole number. 4 is not, you can divide it by 1,2 and 4
Not in a hurry. In principle, here's what you have to do. (This procedure is especially useful when you're letting a computer do it. I've examined all of
the numbers up to several million this way):
Check every integer, from 2 up to 1/2 of the number you're wondering about.
For each one, divide it into the number you're wondering about, to see whether
the smaller number is a factor of the bigger one.
If you make it all the way from 2 up to 1/2 of the big number without finding
a factor, then the big number is prime.
the numbers up to several million this way):
Check every integer, from 2 up to 1/2 of the number you're wondering about.
For each one, divide it into the number you're wondering about, to see whether
the smaller number is a factor of the bigger one.
If you make it all the way from 2 up to 1/2 of the big number without finding
a factor, then the big number is prime.
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