It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 672 721 is not a prime number.
For example, 672 721 can be divided by 7: 672 721 / 7 = 96 103.
For 672 721 to be a prime number, it would have been required that 672 721 has only two divisors, i.e., itself and 1.
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672 721 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 672 721 is about 820.196.
Thus, the square root of 672 721 is not an integer, and therefore 672 721 is not a square number.
The square of a number (here 672 721) is the result of the product of this number (672 721) by itself (i.e., 672 721 × 672 721); the square of 672 721 is sometimes called "raising 672 721 to the power 2", or "672 721 squared".
The square of 672 721 is 452 553 543 841 because 672 721 × 672 721 = 672 7212 = 452 553 543 841.
As a consequence, 672 721 is the square root of 452 553 543 841.
The multiples of 672 721 are all integers evenly divisible by 672 721, that is all numbers such that the remainder of the division by 672 721 is zero. There are infinitely many multiples of 672 721. The smallest multiples of 672 721 are: