In addition we can say of the number 1388 that it is even
1388 is an even number, as it is divisible by 2 : 1388/2 = 694
The factors for 1388 are all the numbers between -1388 and 1388 , which divide 1388 without leaving any remainder. Since 1388 divided by -1388 is an integer, -1388 is a factor of 1388 .
Since 1388 divided by -1388 is a whole number, -1388 is a factor of 1388
Since 1388 divided by -694 is a whole number, -694 is a factor of 1388
Since 1388 divided by -347 is a whole number, -347 is a factor of 1388
Since 1388 divided by -4 is a whole number, -4 is a factor of 1388
Since 1388 divided by -2 is a whole number, -2 is a factor of 1388
Since 1388 divided by -1 is a whole number, -1 is a factor of 1388
Multiples of 1388 are all integers divisible by 1388 , i.e. the remainder of the full division by 1388 is zero. There are infinite multiples of 1388. The smallest multiples of 1388 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 1388, the answer is: No, 1388 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 1388). 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 37.256 ). 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