It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 421 is not a prime number.
For example, 842 421 can be divided by 3: 842 421 / 3 = 280 807.
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For 842 421 to be a prime number, it would have been required that 842 421 has only two divisors, i.e., itself and 1.
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842 421 is an odd number, because it is not evenly divisible by 2.
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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 842 421 is about 917.835.
Thus, the square root of 842 421 is not an integer, and therefore 842 421 is not a square number.
The square of a number (here 842 421) is the result of the product of this number (842 421) by itself (i.e., 842 421 × 842 421); the square of 842 421 is sometimes called "raising 842 421 to the power 2", or "842 421 squared".
The square of 842 421 is 709 673 141 241 because 842 421 × 842 421 = 842 4212 = 709 673 141 241.
As a consequence, 842 421 is the square root of 709 673 141 241.
The multiples of 842 421 are all integers evenly divisible by 842 421, that is all numbers such that the remainder of the division by 842 421 is zero. There are infinitely many multiples of 842 421. The smallest multiples of 842 421 are: