To calculate \( 6.25 \times 10^6 - 4.73 \times 10^6 \), we first observe that both terms are multiplied by \( 10^6 \). Therefore, we can factor out \( 10^6 \):
\[ 6.25 \times 10^6 - 4.73 \times 10^6 = (6.25 - 4.73) \times 10^6 \]
Next, we calculate \( 6.25 - 4.73 \):
\[ 6.25 - 4.73 = 1.52 \]
Now we multiply this result by \( 10^6 \):
\[ 1.52 \times 10^6 \]
Since \( 1.52 \) is already in decimal form with two decimal places, we can express the final answer in scientific notation:
\[ \boxed{1.52 \times 10^6} \]