It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 838 is not a prime number.
For example, 40 838 can be divided by 2: 40 838 / 2 = 20 419.
For 40 838 to be a prime number, it would have been required that 40 838 has only two divisors, i.e., itself and 1.
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40 838 is an even number, because it is evenly divisible by 2: 40 838 / 2 = 20 419.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 40 838 is about 202.084.
Thus, the square root of 40 838 is not an integer, and therefore 40 838 is not a square number.
The square of a number (here 40 838) is the result of the product of this number (40 838) by itself (i.e., 40 838 × 40 838); the square of 40 838 is sometimes called "raising 40 838 to the power 2", or "40 838 squared".
The square of 40 838 is 1 667 742 244 because 40 838 × 40 838 = 40 8382 = 1 667 742 244.
As a consequence, 40 838 is the square root of 1 667 742 244.
The multiples of 40 838 are all integers evenly divisible by 40 838, that is all numbers such that the remainder of the division by 40 838 is zero. There are infinitely many multiples of 40 838. The smallest multiples of 40 838 are: