It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 421 is not a prime number.
For example, 40 421 can be divided by 83: 40 421 / 83 = 487.
For 40 421 to be a prime number, it would have been required that 40 421 has only two divisors, i.e., itself and 1.
Find out more:
40 421 is an odd number, because it is not evenly divisible by 2.
Find out more:
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 40 421 is about 201.050.
Thus, the square root of 40 421 is not an integer, and therefore 40 421 is not a square number.
The square of a number (here 40 421) is the result of the product of this number (40 421) by itself (i.e., 40 421 × 40 421); the square of 40 421 is sometimes called "raising 40 421 to the power 2", or "40 421 squared".
The square of 40 421 is 1 633 857 241 because 40 421 × 40 421 = 40 4212 = 1 633 857 241.
As a consequence, 40 421 is the square root of 1 633 857 241.
The multiples of 40 421 are all integers evenly divisible by 40 421, that is all numbers such that the remainder of the division by 40 421 is zero. There are infinitely many multiples of 40 421. The smallest multiples of 40 421 are: