It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 424 421 is not a prime number.
For example, 424 421 can be divided by 31: 424 421 / 31 = 13 691.
For 424 421 to be a prime number, it would have been required that 424 421 has only two divisors, i.e., itself and 1.
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424 421 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 424 421 is about 651.476.
Thus, the square root of 424 421 is not an integer, and therefore 424 421 is not a square number.
The square of a number (here 424 421) is the result of the product of this number (424 421) by itself (i.e., 424 421 × 424 421); the square of 424 421 is sometimes called "raising 424 421 to the power 2", or "424 421 squared".
The square of 424 421 is 180 133 185 241 because 424 421 × 424 421 = 424 4212 = 180 133 185 241.
As a consequence, 424 421 is the square root of 180 133 185 241.
The multiples of 424 421 are all integers evenly divisible by 424 421, that is all numbers such that the remainder of the division by 424 421 is zero. There are infinitely many multiples of 424 421. The smallest multiples of 424 421 are: