It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 428 is not a prime number.
For example, 421 428 can be divided by 2: 421 428 / 2 = 210 714.
For 421 428 to be a prime number, it would have been required that 421 428 has only two divisors, i.e., itself and 1.
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421 428 is an even number, because it is evenly divisible by 2: 421 428 / 2 = 210 714.
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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 421 428 is about 649.175.
Thus, the square root of 421 428 is not an integer, and therefore 421 428 is not a square number.
The square of a number (here 421 428) is the result of the product of this number (421 428) by itself (i.e., 421 428 × 421 428); the square of 421 428 is sometimes called "raising 421 428 to the power 2", or "421 428 squared".
The square of 421 428 is 177 601 559 184 because 421 428 × 421 428 = 421 4282 = 177 601 559 184.
As a consequence, 421 428 is the square root of 177 601 559 184.
The multiples of 421 428 are all integers evenly divisible by 421 428, that is all numbers such that the remainder of the division by 421 428 is zero. There are infinitely many multiples of 421 428. The smallest multiples of 421 428 are: