The list of all positive divisors (that is, the list of all integers that divide 22) is as follows :
385 is multiplo of 1
385 is multiplo of 5
385 is multiplo of 7
385 is multiplo of 11
385 is multiplo of 35
385 is multiplo of 55
385 is multiplo of 77
385 has 7 positive divisors
385is an odd number,as it is not divisible by 2
The factors for 385 are all the numbers between -385 and 385 , which divide 385 without leaving any remainder. Since 385 divided by -385 is an integer, -385 is a factor of 385 .
Since 385 divided by -385 is a whole number, -385 is a factor of 385
Since 385 divided by -77 is a whole number, -77 is a factor of 385
Since 385 divided by -55 is a whole number, -55 is a factor of 385
Since 385 divided by -35 is a whole number, -35 is a factor of 385
Since 385 divided by -11 is a whole number, -11 is a factor of 385
Since 385 divided by -7 is a whole number, -7 is a factor of 385
Since 385 divided by -5 is a whole number, -5 is a factor of 385
Since 385 divided by -1 is a whole number, -1 is a factor of 385
Multiples of 385 are all integers divisible by 385 , i.e. the remainder of the full division by 385 is zero. There are infinite multiples of 385. The smallest multiples of 385 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 385, the answer is: No, 385 is not a prime number.
To know the primality of an integer, we can use several algorithms. The most naive is to try all divisors below the number you want to know if it is prime (in our case 385). We can already eliminate even numbers bigger than 2 (then 4 , 6 , 8 ...). Besides, we can stop at the square root of the number in question (here 19.621 ). Historically, the Eratosthenes screen (which dates back to Antiquity) uses this technique relatively effectively.
More modern techniques include the Atkin screen, probabilistic tests, or the cyclotomic test.
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