It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 998 is not a prime number.
For example, 40 998 can be divided by 2: 40 998 / 2 = 20 499.
For 40 998 to be a prime number, it would have been required that 40 998 has only two divisors, i.e., itself and 1.
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40 998 is an even number, because it is evenly divisible by 2: 40 998 / 2 = 20 499.
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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 40 998 is about 202.480.
Thus, the square root of 40 998 is not an integer, and therefore 40 998 is not a square number.
The square of a number (here 40 998) is the result of the product of this number (40 998) by itself (i.e., 40 998 × 40 998); the square of 40 998 is sometimes called "raising 40 998 to the power 2", or "40 998 squared".
The square of 40 998 is 1 680 836 004 because 40 998 × 40 998 = 40 9982 = 1 680 836 004.
As a consequence, 40 998 is the square root of 1 680 836 004.
The multiples of 40 998 are all integers evenly divisible by 40 998, that is all numbers such that the remainder of the division by 40 998 is zero. There are infinitely many multiples of 40 998. The smallest multiples of 40 998 are: