In addition we can say of the number 842 that it is even
842 is an even number, as it is divisible by 2 : 842/2 = 421
The factors for 842 are all the numbers between -842 and 842 , which divide 842 without leaving any remainder. Since 842 divided by -842 is an integer, -842 is a factor of 842 .
Since 842 divided by -842 is a whole number, -842 is a factor of 842
Since 842 divided by -421 is a whole number, -421 is a factor of 842
Since 842 divided by -2 is a whole number, -2 is a factor of 842
Since 842 divided by -1 is a whole number, -1 is a factor of 842
Multiples of 842 are all integers divisible by 842 , i.e. the remainder of the full division by 842 is zero. There are infinite multiples of 842. The smallest multiples of 842 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 842, the answer is: No, 842 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 842). 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 29.017 ). 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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Next prime number: 853