1993is an odd number,as it is not divisible by 2
The factors for 1993 are all the numbers between -1993 and 1993 , which divide 1993 without leaving any remainder. Since 1993 divided by -1993 is an integer, -1993 is a factor of 1993 .
Since 1993 divided by -1993 is a whole number, -1993 is a factor of 1993
Since 1993 divided by -1 is a whole number, -1 is a factor of 1993
Multiples of 1993 are all integers divisible by 1993 , i.e. the remainder of the full division by 1993 is zero. There are infinite multiples of 1993. The smallest multiples of 1993 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 1993, the answer is: yes, 1993 is a prime number because it only has two different divisors: 1 and itself (1993).
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 1993). 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 44.643 ). 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: 1987
Next prime number: 1997