It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 621 is not a prime number.
For example, 842 621 can be divided by 13: 842 621 / 13 = 64 817.
For 842 621 to be a prime number, it would have been required that 842 621 has only two divisors, i.e., itself and 1.
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842 621 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 842 621 is about 917.944.
Thus, the square root of 842 621 is not an integer, and therefore 842 621 is not a square number.
The square of a number (here 842 621) is the result of the product of this number (842 621) by itself (i.e., 842 621 × 842 621); the square of 842 621 is sometimes called "raising 842 621 to the power 2", or "842 621 squared".
The square of 842 621 is 710 010 149 641 because 842 621 × 842 621 = 842 6212 = 710 010 149 641.
As a consequence, 842 621 is the square root of 710 010 149 641.
The multiples of 842 621 are all integers evenly divisible by 842 621, that is all numbers such that the remainder of the division by 842 621 is zero. There are infinitely many multiples of 842 621. The smallest multiples of 842 621 are: