It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 021 is not a prime number.
For example, 421 021 can be divided by 19: 421 021 / 19 = 22 159.
For 421 021 to be a prime number, it would have been required that 421 021 has only two divisors, i.e., itself and 1.
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421 021 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 421 021 is about 648.861.
Thus, the square root of 421 021 is not an integer, and therefore 421 021 is not a square number.
The square of a number (here 421 021) is the result of the product of this number (421 021) by itself (i.e., 421 021 × 421 021); the square of 421 021 is sometimes called "raising 421 021 to the power 2", or "421 021 squared".
The square of 421 021 is 177 258 682 441 because 421 021 × 421 021 = 421 0212 = 177 258 682 441.
As a consequence, 421 021 is the square root of 177 258 682 441.
The multiples of 421 021 are all integers evenly divisible by 421 021, that is all numbers such that the remainder of the division by 421 021 is zero. There are infinitely many multiples of 421 021. The smallest multiples of 421 021 are: