It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 498 is not a prime number.
For example, 421 498 can be divided by 2: 421 498 / 2 = 210 749.
For 421 498 to be a prime number, it would have been required that 421 498 has only two divisors, i.e., itself and 1.
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421 498 is an even number, because it is evenly divisible by 2: 421 498 / 2 = 210 749.
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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 421 498 is about 649.229.
Thus, the square root of 421 498 is not an integer, and therefore 421 498 is not a square number.
The square of a number (here 421 498) is the result of the product of this number (421 498) by itself (i.e., 421 498 × 421 498); the square of 421 498 is sometimes called "raising 421 498 to the power 2", or "421 498 squared".
The square of 421 498 is 177 660 564 004 because 421 498 × 421 498 = 421 4982 = 177 660 564 004.
As a consequence, 421 498 is the square root of 177 660 564 004.
The multiples of 421 498 are all integers evenly divisible by 421 498, that is all numbers such that the remainder of the division by 421 498 is zero. There are infinitely many multiples of 421 498. The smallest multiples of 421 498 are: