It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 409 is not a prime number.
For example, 40 409 can be divided by 17: 40 409 / 17 = 2 377.
For 40 409 to be a prime number, it would have been required that 40 409 has only two divisors, i.e., itself and 1.
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40 409 is an odd number, because it is not evenly divisible by 2.
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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 40 409 is about 201.020.
Thus, the square root of 40 409 is not an integer, and therefore 40 409 is not a square number.
The square of a number (here 40 409) is the result of the product of this number (40 409) by itself (i.e., 40 409 × 40 409); the square of 40 409 is sometimes called "raising 40 409 to the power 2", or "40 409 squared".
The square of 40 409 is 1 632 887 281 because 40 409 × 40 409 = 40 4092 = 1 632 887 281.
As a consequence, 40 409 is the square root of 1 632 887 281.
The multiples of 40 409 are all integers evenly divisible by 40 409, that is all numbers such that the remainder of the division by 40 409 is zero. There are infinitely many multiples of 40 409. The smallest multiples of 40 409 are: