It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 671 is not a prime number.
For example, 842 671 can be divided by 43: 842 671 / 43 = 19 597.
For 842 671 to be a prime number, it would have been required that 842 671 has only two divisors, i.e., itself and 1.
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842 671 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 842 671 is about 917.971.
Thus, the square root of 842 671 is not an integer, and therefore 842 671 is not a square number.
The square of a number (here 842 671) is the result of the product of this number (842 671) by itself (i.e., 842 671 × 842 671); the square of 842 671 is sometimes called "raising 842 671 to the power 2", or "842 671 squared".
The square of 842 671 is 710 094 414 241 because 842 671 × 842 671 = 842 6712 = 710 094 414 241.
As a consequence, 842 671 is the square root of 710 094 414 241.
The multiples of 842 671 are all integers evenly divisible by 842 671, that is all numbers such that the remainder of the division by 842 671 is zero. There are infinitely many multiples of 842 671. The smallest multiples of 842 671 are: