It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 088 is not a prime number.
For example, 421 088 can be divided by 2: 421 088 / 2 = 210 544.
For 421 088 to be a prime number, it would have been required that 421 088 has only two divisors, i.e., itself and 1.
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421 088 is an even number, because it is evenly divisible by 2: 421 088 / 2 = 210 544.
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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 421 088 is about 648.913.
Thus, the square root of 421 088 is not an integer, and therefore 421 088 is not a square number.
The square of a number (here 421 088) is the result of the product of this number (421 088) by itself (i.e., 421 088 × 421 088); the square of 421 088 is sometimes called "raising 421 088 to the power 2", or "421 088 squared".
The square of 421 088 is 177 315 103 744 because 421 088 × 421 088 = 421 0882 = 177 315 103 744.
As a consequence, 421 088 is the square root of 177 315 103 744.
The multiples of 421 088 are all integers evenly divisible by 421 088, that is all numbers such that the remainder of the division by 421 088 is zero. There are infinitely many multiples of 421 088. The smallest multiples of 421 088 are: