It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 742 021 is not a prime number.
For example, 742 021 can be divided by 7: 742 021 / 7 = 106 003.
For 742 021 to be a prime number, it would have been required that 742 021 has only two divisors, i.e., itself and 1.
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742 021 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 742 021 is about 861.406.
Thus, the square root of 742 021 is not an integer, and therefore 742 021 is not a square number.
The square of a number (here 742 021) is the result of the product of this number (742 021) by itself (i.e., 742 021 × 742 021); the square of 742 021 is sometimes called "raising 742 021 to the power 2", or "742 021 squared".
The square of 742 021 is 550 595 164 441 because 742 021 × 742 021 = 742 0212 = 550 595 164 441.
As a consequence, 742 021 is the square root of 550 595 164 441.
The multiples of 742 021 are all integers evenly divisible by 742 021, that is all numbers such that the remainder of the division by 742 021 is zero. There are infinitely many multiples of 742 021. The smallest multiples of 742 021 are: