The list of all positive divisors (that is, the list of all integers that divide 22) is as follows :
1390 is multiplo of 1
1390 is multiplo of 2
1390 is multiplo of 5
1390 is multiplo of 10
1390 is multiplo of 139
1390 is multiplo of 278
1390 is multiplo of 695
1390 has 7 positive divisors
In addition we can say of the number 1390 that it is even
1390 is an even number, as it is divisible by 2 : 1390/2 = 695
The factors for 1390 are all the numbers between -1390 and 1390 , which divide 1390 without leaving any remainder. Since 1390 divided by -1390 is an integer, -1390 is a factor of 1390 .
Since 1390 divided by -1390 is a whole number, -1390 is a factor of 1390
Since 1390 divided by -695 is a whole number, -695 is a factor of 1390
Since 1390 divided by -278 is a whole number, -278 is a factor of 1390
Since 1390 divided by -139 is a whole number, -139 is a factor of 1390
Since 1390 divided by -10 is a whole number, -10 is a factor of 1390
Since 1390 divided by -5 is a whole number, -5 is a factor of 1390
Since 1390 divided by -2 is a whole number, -2 is a factor of 1390
Since 1390 divided by -1 is a whole number, -1 is a factor of 1390
Multiples of 1390 are all integers divisible by 1390 , i.e. the remainder of the full division by 1390 is zero. There are infinite multiples of 1390. The smallest multiples of 1390 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 1390, the answer is: No, 1390 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 1390). 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 37.283 ). 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: 1381
Next prime number: 1399