It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 201 is not a prime number.
For example, 721 201 can be divided by 13: 721 201 / 13 = 55 477.
For 721 201 to be a prime number, it would have been required that 721 201 has only two divisors, i.e., itself and 1.
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721 201 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 721 201 is about 849.236.
Thus, the square root of 721 201 is not an integer, and therefore 721 201 is not a square number.
The square of a number (here 721 201) is the result of the product of this number (721 201) by itself (i.e., 721 201 × 721 201); the square of 721 201 is sometimes called "raising 721 201 to the power 2", or "721 201 squared".
The square of 721 201 is 520 130 882 401 because 721 201 × 721 201 = 721 2012 = 520 130 882 401.
As a consequence, 721 201 is the square root of 520 130 882 401.
The multiples of 721 201 are all integers evenly divisible by 721 201, that is all numbers such that the remainder of the division by 721 201 is zero. There are infinitely many multiples of 721 201. The smallest multiples of 721 201 are: