In addition we can say of the number 1982 that it is even
1982 is an even number, as it is divisible by 2 : 1982/2 = 991
The factors for 1982 are all the numbers between -1982 and 1982 , which divide 1982 without leaving any remainder. Since 1982 divided by -1982 is an integer, -1982 is a factor of 1982 .
Since 1982 divided by -1982 is a whole number, -1982 is a factor of 1982
Since 1982 divided by -991 is a whole number, -991 is a factor of 1982
Since 1982 divided by -2 is a whole number, -2 is a factor of 1982
Since 1982 divided by -1 is a whole number, -1 is a factor of 1982
Multiples of 1982 are all integers divisible by 1982 , i.e. the remainder of the full division by 1982 is zero. There are infinite multiples of 1982. The smallest multiples of 1982 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 1982, the answer is: No, 1982 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 1982). 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 44.52 ). 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.
Previous prime number: 1979
Next prime number: 1987