It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 521 is not a prime number.
For example, 40 521 can be divided by 3: 40 521 / 3 = 13 507.
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For 40 521 to be a prime number, it would have been required that 40 521 has only two divisors, i.e., itself and 1.
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40 521 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 40 521 is about 201.298.
Thus, the square root of 40 521 is not an integer, and therefore 40 521 is not a square number.
The square of a number (here 40 521) is the result of the product of this number (40 521) by itself (i.e., 40 521 × 40 521); the square of 40 521 is sometimes called "raising 40 521 to the power 2", or "40 521 squared".
The square of 40 521 is 1 641 951 441 because 40 521 × 40 521 = 40 5212 = 1 641 951 441.
As a consequence, 40 521 is the square root of 1 641 951 441.
The multiples of 40 521 are all integers evenly divisible by 40 521, that is all numbers such that the remainder of the division by 40 521 is zero. There are infinitely many multiples of 40 521. The smallest multiples of 40 521 are: