It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 021 is not a prime number.
For example, 40 021 can be divided by 31: 40 021 / 31 = 1 291.
For 40 021 to be a prime number, it would have been required that 40 021 has only two divisors, i.e., itself and 1.
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40 021 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 40 021 is about 200.052.
Thus, the square root of 40 021 is not an integer, and therefore 40 021 is not a square number.
The square of a number (here 40 021) is the result of the product of this number (40 021) by itself (i.e., 40 021 × 40 021); the square of 40 021 is sometimes called "raising 40 021 to the power 2", or "40 021 squared".
The square of 40 021 is 1 601 680 441 because 40 021 × 40 021 = 40 0212 = 1 601 680 441.
As a consequence, 40 021 is the square root of 1 601 680 441.
The multiples of 40 021 are all integers evenly divisible by 40 021, that is all numbers such that the remainder of the division by 40 021 is zero. There are infinitely many multiples of 40 021. The smallest multiples of 40 021 are: