It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 671 634 is not a prime number.
For example, 671 634 can be divided by 2: 671 634 / 2 = 335 817.
For 671 634 to be a prime number, it would have been required that 671 634 has only two divisors, i.e., itself and 1.
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671 634 is an even number, because it is evenly divisible by 2: 671 634 / 2 = 335 817.
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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 671 634 is about 819.533.
Thus, the square root of 671 634 is not an integer, and therefore 671 634 is not a square number.
The square of a number (here 671 634) is the result of the product of this number (671 634) by itself (i.e., 671 634 × 671 634); the square of 671 634 is sometimes called "raising 671 634 to the power 2", or "671 634 squared".
The square of 671 634 is 451 092 229 956 because 671 634 × 671 634 = 671 6342 = 451 092 229 956.
As a consequence, 671 634 is the square root of 451 092 229 956.
The multiples of 671 634 are all integers evenly divisible by 671 634, that is all numbers such that the remainder of the division by 671 634 is zero. There are infinitely many multiples of 671 634. The smallest multiples of 671 634 are: