It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 700 721 is not a prime number.
For example, 700 721 can be divided by 7: 700 721 / 7 = 100 103.
For 700 721 to be a prime number, it would have been required that 700 721 has only two divisors, i.e., itself and 1.
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700 721 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 700 721 is about 837.091.
Thus, the square root of 700 721 is not an integer, and therefore 700 721 is not a square number.
The square of a number (here 700 721) is the result of the product of this number (700 721) by itself (i.e., 700 721 × 700 721); the square of 700 721 is sometimes called "raising 700 721 to the power 2", or "700 721 squared".
The square of 700 721 is 491 009 919 841 because 700 721 × 700 721 = 700 7212 = 491 009 919 841.
As a consequence, 700 721 is the square root of 491 009 919 841.
The multiples of 700 721 are all integers evenly divisible by 700 721, that is all numbers such that the remainder of the division by 700 721 is zero. There are infinitely many multiples of 700 721. The smallest multiples of 700 721 are: