It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 042 is not a prime number.
For example, 421 042 can be divided by 2: 421 042 / 2 = 210 521.
For 421 042 to be a prime number, it would have been required that 421 042 has only two divisors, i.e., itself and 1.
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421 042 is an even number, because it is evenly divisible by 2: 421 042 / 2 = 210 521.
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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 421 042 is about 648.877.
Thus, the square root of 421 042 is not an integer, and therefore 421 042 is not a square number.
The square of a number (here 421 042) is the result of the product of this number (421 042) by itself (i.e., 421 042 × 421 042); the square of 421 042 is sometimes called "raising 421 042 to the power 2", or "421 042 squared".
The square of 421 042 is 177 276 365 764 because 421 042 × 421 042 = 421 0422 = 177 276 365 764.
As a consequence, 421 042 is the square root of 177 276 365 764.
The multiples of 421 042 are all integers evenly divisible by 421 042, that is all numbers such that the remainder of the division by 421 042 is zero. There are infinitely many multiples of 421 042. The smallest multiples of 421 042 are: