It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 494 is not a prime number.
For example, 421 494 can be divided by 2: 421 494 / 2 = 210 747.
For 421 494 to be a prime number, it would have been required that 421 494 has only two divisors, i.e., itself and 1.
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421 494 is an even number, because it is evenly divisible by 2: 421 494 / 2 = 210 747.
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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 421 494 is about 649.226.
Thus, the square root of 421 494 is not an integer, and therefore 421 494 is not a square number.
The square of a number (here 421 494) is the result of the product of this number (421 494) by itself (i.e., 421 494 × 421 494); the square of 421 494 is sometimes called "raising 421 494 to the power 2", or "421 494 squared".
The square of 421 494 is 177 657 192 036 because 421 494 × 421 494 = 421 4942 = 177 657 192 036.
As a consequence, 421 494 is the square root of 177 657 192 036.
The multiples of 421 494 are all integers evenly divisible by 421 494, that is all numbers such that the remainder of the division by 421 494 is zero. There are infinitely many multiples of 421 494. The smallest multiples of 421 494 are: