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Earn +20 ptsQ: What do divide a number by to see if its prime?
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How do you check if a large number is prime or a composite number?
You divide the number by 2. If the number is able to divide WITHOUT a remainder, then it is a prime number. If you divide a number by 1, you will get the same number. That is not a prime number.
Is 2011 prime?
Yes. To prove it, you can take the square root of 2011 (about 44.8), and divide 2011 by all the prime numbers under this number. You'll see none of them divide, so it's prime.
Is 120 a prime or not prime number?
120 is NOT a prime number because you can divide it by 10 and 5 and 2....
Is 267 a prime number?
No it is not. A prime number will only divide (to give an integer as a result) by 1 and itself. 267 will also divide by 89 & 3 so it is not prime.
What prime number will divide into 215?
The prime numbers are: 5 and 43
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